（悬赏30分）七年级下册解二元一次方程组100道,解不等式100道,解不等式组70道老师布置孩子做 家长不会出题
贫乳圆香☆263
&1X-15≥2(X-14)-10 & & 7X-1≤1(X-8)-82. &4X-19≥6(X-16)-1 & & 1X+18≥3(X+4)+33. &6X-16&1(X-12)-6 & & 5X+2≥6(X+7)+44. &2X-20≥4(X-15)-7 & & 6X+19&1(X+3)+95. &3X+17&6(X+11)+2 & & 1X-8≤1(X-4)-76. &7X-14&7(X-18)-5 & & 4X+12≤5(X+6)+87. &1X+10≤2(X+14)+10 & & 5X-9≥7(X-2)-38. &4X-15≤6(X-16)-1 & & 2X+6≥1(X+9)+69. &6X+4&5(X+17)+9 & & 3X-2&3(X-5)-110. &1X+13≤5(X+20)+5 & & 7X+19&4(X+14)+311. &5X-10≥6(X-7)-8 & & 2X+8≥4(X+15)+112. &6X-6&1(X-3)-3 & & 6X-5&5(X-3)-413. &3X-4&2(X-11)-7 & & 7X+2&7(X+19)+914. &5X-13≤2(X-12)-5 & & 2X+11≥7(X+20)+715. &1X+10≤3(X+19)+9 & & 6X-20&6(X-12)-416. &3X-19&3(X-20)-7 & & 7X+17&1(X+8)+917. &5X-8≥3(X-2)-5 & & 4X-6≤7(X-1)-618. &2X+5≥4(X+9)+8 & & 6X+15&7(X+20)+619. &3X-13&4(X-8)-9 & & 3X-12&1(X-8)-1020. &7X+10&6(X+16)+2 & & 5X-1≤1(X-9)-821. &2X+12&3(X+2)+3 & & 6X-10&1(X-10)-622. &6X-9&4(X-9)-7 & & 3X-7&2(X-17)-923. &1X+18≤4(X+11)+5 & & 5X-16≥2(X-19)-724. &4X-15≤5(X-18)-9 & & 2X+6&1(X+11)+425. &6X-4&5(X-19)-7 & & 4X+15≤7(X+14)+1026. &1X-6&3(X-7)-5 & & 1X-12≤2(X-1)-327. &5X+3&4(X+14)+9 & & 2X-1&1(X-2)-128. &7X+12≤4(X+15)+7 & & 6X+11≤7(X+15)+829. &4X-1≥3(X-8)-3 & & 1X-19&7(X-16)-630. &6X-10&3(X-9)-1 & & 4X+1≥5(X+2)+731. &3X-20≤2(X-20)-1 & & 7X+18≤6(X+8)+332. &5X-9&2(X-1)-8 & & 2X+19&4(X+14)+433. &7X-10≥6(X-7)-9 & & 6X-16&5(X-1)-834. &4X+7≥7(X+14)+3 & & 1X-18&3(X-8)-935. &6X+9≤5(X+1)+4 & & 5X+7&2(X+20)+536. &3X-18≥4(X-15)-8 & & 7X+17&1(X+3)+137. &5X-7&4(X-16)-6 & & 2X+18≥6(X+9)+238. &2X+17≤3(X+8)+3 & & 7X-8&5(X-1)-939. &4X+18&7(X+14)+4 & & 1X-17≤5(X-2)-640. &1X-8≤6(X-7)-1 & & 6X+6≥4(X+15)+341. &3X-17&6(X-6)-1 & & 1X+8&2(X+20)+642. &5X-18≥4(X-13)-2 & & 5X-17≤1(X-12)-343. &3X+8&3(X+5)+9 & & 7X-19&5(X-18)-444. &5X+9≥1(X+11)+10 & & 4X+8≤4(X+11)+145. &2X-18&1(X-13)-3 & & 7X+8&3(X+6)+846. &4X-19≥5(X-19)-4 & & 2X+10&1(X+12)+947. &1X+9&4(X+11)+10 & & 6X-19&7(X-5)-648. &4X+10≥2(X+18)+1 & & 1X-1&4(X-11)-749. &6X+11&7(X+2)+5 & & 5X+10&4(X+2)+650. &3X-1≤6(X-15)-1 & & 1X+12≥1(X+8)+751. &6X-15≤1(X-6)-5 & & 5X-1&7(X-20)-452. &3X+5≥7(X+19)+2 & & 7X+16&2(X+13)+553. &5X-6≤5(X-6)-1 & & 3X+17&7(X+19)+654. &2X+16≥4(X+19)+7 & & 7X-7&6(X-12)-355. &5X+10≥6(X+10)+1 & & 2X-8≥4(X-18)-456. &2X-19≥5(X-1)-10 & & 7X+10&1(X+14)+657. &4X-1≤3(X-7)-1 & & 2X+11&5(X+20)+758. &7X+15≤5(X+18)+5 & & 6X+1&4(X+13)+359. &4X-4≥4(X-11)-2 & & 2X+15&7(X+6)+560. &7X+18≥7(X+4)+3 & & 6X+5≤5(X+18)+21.2x+9y=81 & 3x+y=34 2.9x+4y=35 & 8x+3y=30 3.7x+2y=52 & 7x+4y=62 4.4x+6y=54 & 9x+2y=87 5.2x+y=7 & 2x+5y=19 6.x+2y=21 & 3x+5y=56 7.5x+7y=52 & 5x+2y=22 8.5x+5y=65 & 7x+7y=203 9.8x+4y=56 & x+4y=2110.5x+7y=41 & 5x+8y=4411.7x+5y=54 & 3x+4y=3812.x+8y=15 & 4x+y=2913.3x+6y=24 & 9x+5y=4614.9x+2y=62 & 4x+3y=3615.9x+4y=46 & 7x+4y=4216.9x+7y=135 & 4x+y=4117.3x+8y=51 & x+6y=2718.9x+3y=99 & 4x+7y=9519.9x+2y=38 & 3x+6y=1820.5x+5y=45 & 7x+9y=6921.8x+2y=28 & 7x+8y=6222.x+6y=14 & 3x+3y=2723.7x+4y=67 & 2x+8y=2624.5x+4y=52 & 7x+6y=7425.7x+y=9 & 4x+6y=1626.6x+6y=48 & 6x+3y=4227.8x+2y=16 & 7x+y=1128.4x+9y=77 & 8x+6y=9429.6x+8y=68 & 7x+6y=6630.2x+2y=22 & 7x+2y=47 31. x-y=3
& 3x-8y=4 & x=y+332. &3x+2y=7 & &5x-2y=133. x=3-5t & 3y-2t=x(33) 40x+31y=6043 45x-y=3555 (34) 47x+50y=8598 45x+y=3780 (35) 45x-30y=-1455 29x-y=725 (36) 11x-43y=-1361 47x+y=799 (37) 33x+59y=3254 94x+y=1034 (38) 89x-74y=-2735 68x+y=1020 (39) 94x+71y=7517 78x+y=3822 (40) 28x-62y=-4934 46x+y=552 (41) 75x+43y=8472 17x-y=1394 (42) 41x-38y=-1180 29x+y=1450 (43) 22x-59y=824 63x+y=4725 (44) 95x-56y=-401 90x+y=1530 (45) 93x-52y=-852 29x+y=464 (46) 93x+12y=8823 54x+y=4914 (47) 21x-63y=84 20x+y=1880 (48) 48x+93y=9756 38x-y=950 (49) 99x-67y=4011 75x-y=5475
(50) 83x+64y=9291 90x-y=3690
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扫描下载二维码二元一次方程组练习题、简单点,数字不要太大
小团团00448
1.2x+9y=81 3x+y=34 2.9x+4y=35 8x+3y=30 3.7x+2y=52 7x+4y=62 4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2y=21 3x+5y=56 7.5x+7y=52 5x+2y=22 8.5x+5y=65 7x+7y=203 9.8x+4y=56 x+4y=21 10.5x+7y=41 5x+8y=44 11.7x+5y=54 3x+4y=38 12.x+8y=15 4x+y=29 13.3x+6y=24 9x+5y=46 14.9x+2y=62 4x+3y=36 15.9x+4y=46 7x+4y=42 16.9x+7y=135 4x+y=41 17.3x+8y=51 x+6y=27 18.9x+3y=99 4x+7y=95 19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 21.8x+2y=28 7x+8y=62 22.x+6y=14 3x+3y=27 23.7x+4y=67 2x+8y=26 24.5x+4y=52 7x+6y=74 25.7x+y=9 4x+6y=16 26.6x+6y=48 6x+3y=42 27.8x+2y=16 7x+y=11 28.4x+9y=77 8x+6y=94 29.6x+8y=68 7x+6y=66 30.2x+2y=22 7x+2y=47 ) 66x+17y=3967 25x+y=1200 答案：x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案：x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案：x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案：x=98 y=51 (5) 67x+54y=8546 71x-y=5680 答案：x=80 y=59 (6) 42x-95y=-1410 21x-y=1575 答案：x=75 y=48 (7) 47x-40y=853 34x-y=2006 答案：x=59 y=48 (8) 19x-32y=-1786 75x+y=4950 答案：x=66 y=95 (9) 97x+24y=7202 58x-y=2900 答案：x=50 y=98 (10) 42x+85y=6362 63x-y=1638 答案：x=26 y=62 (11) 85x-92y=-2518 27x-y=486 答案：x=18 y=44 (12) 79x+40y=2419 56x-y=1176 答案：x=21 y=19 (13) 80x-87y=2156 22x-y=880 答案：x=40 y=12 (14) 32x+62y=5134 57x+y=2850 答案：x=50 y=57 (15) 83x-49y=82 59x+y=2183 答案：x=37 y=61 (16) 91x+70y=5845 95x-y=4275 答案：x=45 y=25 (17) 29x+44y=5281 88x-y=3608 答案：x=41 y=93 (18) 25x-95y=-4355 40x-y=2000 答案：x=50 y=59 (19) 54x+68y=3284 78x+y=1404 答案：x=18 y=34 (20) 70x+13y=3520 52x+y=2132 答案：x=41 y=50 (21) 48x-54y=-3186 24x+y=1080 答案：x=45 y=99 (22) 36x+77y=7619 47x-y=799 答案：x=17 y=91 (23) 13x-42y=-2717 31x-y=1333 答案：x=43 y=78 (24) 28x+28y=3332 52x-y=4628 答案：x=89 y=30 (25) 62x-98y=-2564 46x-y=2024 答案：x=44 y=54 (26) 79x-76y=-4388 26x-y=832 答案：x=32 y=91 (27) 63x-40y=-821 42x-y=546 答案：x=13 y=41 (28) 69x-96y=-1209 42x+y=3822 答案：x=91 y=78 (29) 85x+67y=7338 11x+y=308 答案：x=28 y=74 (30) 78x+74y=12928 14x+y=1218 答案：x=87 y=83 (31) 39x+42y=5331 59x-y=5841 答案：x=99 y=35 (32) 29x+18y=1916 58x+y=2320 答案：x=40 y=42 (33) 40x+31y=6043 45x-y=3555 答案：x=79 y=93 (34) 47x+50y=8598 45x+y=3780 答案：x=84 y=93 (35) 45x-30y=-1455 29x-y=725 答案：x=25 y=86 (36) 11x-43y=-1361 47x+y=799 答案：x=17 y=36 (37) 33x+59y=3254 94x+y=1034 答案：x=11 y=49 (38) 89x-74y=-2735 68x+y=1020 答案：x=15 y=55 (39) 94x+71y=7517 78x+y=3822 答案：x=49 y=41 (40) 28x-62y=-4934 46x+y=552 答案：x=12 y=85 (41) 75x+43y=8472 17x-y=1394 答案：x=82 y=54 (42) 41x-38y=-1180 29x+y=1450 答案：x=50 y=85 (43) 22x-59y=824 63x+y=4725 答案：x=75 y=14 (44) 95x-56y=-401 90x+y=1530 答案：x=17 y=36 (45) 93x-52y=-852 29x+y=464 答案：x=16 y=45 (46) 93x+12y=8823 54x+y=4914 答案：x=91 y=30 (47) 21x-63y=84 20x+y=1880 答案：x=94 y=30 (48) 48x+93y=9756 38x-y=950 答案：x=25 y=92 (49) 99x-67y=4011 75x-y=5475 答案：x=73 y=48 (50) 83x+64y=9291 90x-y=3690 答案：x=41 y=92 (51) 17x+62y=3216 75x-y=7350 答案：x=98 y=25 (52) 77x+67y=2739 14x-y=364 答案：x=26 y=11 (53) 20x-68y=-4596 14x-y=924 答案：x=66 y=87 (54) 23x+87y=4110 83x-y=5727 答案：x=69 y=29 (55) 22x-38y=804 86x+y=6708 答案：x=78 y=24 (56) 20x-45y=-3520 56x+y=728 答案：x=13 y=84 (57) 46x+37y=7085 61x-y=4636 答案：x=76 y=97 (58) 17x+61y=4088 71x+y=5609 答案：x=79 y=45 (59) 51x-61y=-1907 89x-y=2314 答案：x=26 y=53 (60) 69x-98y=-2404 21x+y=1386 答案：x=66 y=71 (61) 15x-41y=754 74x-y=6956 答案：x=94 y=16 (62) 78x-55y=656 89x+y=5518 答案：x=62 y=76 (63) 29x+21y=1633 31x-y=713 答案：x=23 y=46 (64) 58x-28y=2724 35x+y=3080 答案：x=88 y=85 (65) 28x-63y=-2254 88x-y=2024 答案：x=23 y=46 (66) 43x+50y=7064 85x+y=8330 答案：x=98 y=57 (67) 58x-77y=1170 38x-y=2280 答案：x=60 y=30 (68) 92x+83y=11586 43x+y=3010 答案：x=70 y=62 (69) 99x+82y=6055 52x-y=1716 答案：x=33 y=34 (70) 15x+26y=1729 94x+y=8554 答案：x=91 y=14 (71) 64x+32y=3552 56x-y=2296 答案：x=41 y=29 (72) 94x+66y=10524 84x-y=7812 答案：x=93 y=27 (73) 65x-79y=-5815 89x+y=2314 答案：x=26 y=95 (74) 96x+54y=6216 63x-y=1953 答案：x=31 y=60 (75) 60x-44y=-352 33x-y=1452 答案：x=44 y=68 (76) 79x-45y=510 14x-y=840 答案：x=60 y=94 (77) 29x-35y=-218 59x-y=4897 答案：x=83 y=75 (78) 33x-24y=1905 30x+y=2670 答案：x=89 y=43 (79) 61x+94y=11800 93x+y=5952 答案：x=64 y=84 (80) 61x+90y=5001 48x+y=2448 答案：x=51 y=21 (81) 93x-19y=2 86x-y=1548 答案：x=18 y=88 (82) 19x-96y=-5910 30x-y=2340 答案：x=78 y=77 (83) 80x+74y=8088 96x-y=8640 答案：x=90 y=12 (84) 53x-94y=1946 45x+y=2610 答案：x=58 y=12 (85) 93x+12y=9117 28x-y=2492 答案：x=89 y=70 (86) 66x-71y=-1673 99x-y=7821 答案：x=79 y=97 (87) 43x-52y=-1742 76x+y=1976 答案：x=26 y=55 (88) 70x+35y=8295 40x+y=2920 答案：x=73 y=91 (89) 43x+82y=4757 11x+y=231 答案：x=21 y=47 (90) 12x-19y=236 95x-y=7885 答案：x=83 y=40 (91) 51x+99y=8031 71x-y=2911 答案：x=41 y=60 (92) 37x+74y=4403 69x-y=6003 答案：x=87 y=16 (93) 46x+34y=4820 71x-y=5183 答案：x=73 y=43 (94) 47x+98y=5861 55x-y=4565 答案：x=83 y=20 (95) 30x-17y=239 28x+y=1064 答案：x=38 y=53 (96) 55x-12y=4112 79x-y=7268 答案：x=92 y=79 (97) 27x-24y=-450 67x-y=3886 答案：x=58 y=84 (98) 97x+23y=8119 14x+y=966 答案：x=69 y=62 (99) 84x+53y=11275 70x+y=6790 答案：x=97 y=59 (100) 51x-97y=297 19x-y=1520 答案：x=80 y=39 2x+9y=81 3x+y=34 9x+4y=35 8x+3y=30 7x+2y=52 7x+4y=62 4x+6y=54 9x+2y=87 2x+y=7 2x+5y=19 x+2y=21 3x+5y=56 5x+7y=52 5x+2y=22 5x+5y=65 7x+7y=203 8x+4y=56 x+4y=21 5x+7y=41 5x+8y=44 7x+5y=54 3x+4y=38 x+8y=15 4x+y=29 3x+6y=24 9x+5y=46 9x+2y=62 4x+3y=36 9x+4y=46 7x+4y=42 9x+7y=135 4x+y=41 3x+8y=51 x+6y=27 9x+3y=99 4x+7y=95 9x+2y=38 3x+6y=18 1) 66x+17y=3967
25x+y=1200
答案：x=48 y=47
(2) 18x+23y=2303
74x-y=1998
答案：x=27 y=79
(3) 44x+90y=7796
44x+y=3476
答案：x=79 y=48
(4) 76x-66y=4082
30x-y=2940
答案：x=98 y=51
(5) 67x+54y=8546
71x-y=5680
答案：x=80 y=59
(6) 42x-95y=-1410
21x-y=1575
答案：x=75 y=48
(7) 47x-40y=853
34x-y=2006
答案：x=59 y=48
(8) 19x-32y=-1786
75x+y=4950
答案：x=66 y=95
(9) 97x+24y=7202
58x-y=2900
答案：x=50 y=98
(10) 42x+85y=6362
63x-y=1638
答案：x=26 y=62
(11) 85x-92y=-2518
答案：x=18 y=44
(12) 79x+40y=2419
56x-y=1176
答案：x=21 y=19
(13) 80x-87y=2156
答案：x=40 y=12
(14) 32x+62y=5134
57x+y=2850
答案：x=50 y=57
(15) 83x-49y=82
59x+y=2183
答案：x=37 y=61
(16) 91x+70y=5845
95x-y=4275
答案：x=45 y=25
(17) 29x+44y=5281
88x-y=3608
答案：x=41 y=93
(18) 25x-95y=-4355
40x-y=2000
答案：x=50 y=59
(19) 54x+68y=3284
78x+y=1404
答案：x=18 y=34
(20) 70x+13y=3520
52x+y=2132 2x+9y=81 3x+y=34 2.9x+4y=35 8x+3y=30 3.7x+2y=52 7x+4y=62 4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2y=21 3x+5y=56 7.5x+7y=52 5x+2y=22 8.5x+5y=65 7x+7y=203 9.8x+4y=56 x+4y=21 10.5x+7y=41 5x+8y=44 11.7x+5y=54 3x+4y=38 12.x+8y=15 4x+y=29 13.3x+6y=24 9x+5y=46 14.9x+2y=62 4x+3y=36 15.9x+4y=46 7x+4y=42 16.9x+7y=135 4x+y=41 17.3x+8y=51 x+6y=27 18.9x+3y=99 4x+7y=95 19.9x+2y=38 3x+6y=18 20.5x+5y=45 7x+9y=69 21.8x+2y=28 7x+8y=62 22.x+6y=14 3x+3y=27 23.7x+4y=67 2x+8y=26 24.5x+4y=52 7x+6y=74 25.7x+y=9 4x+6y=16 26.6x+6y=48 6x+3y=42 27.8x+2y=16 7x+y=11 28.4x+9y=77 8x+6y=94 29.6x+8y=68 7x+6y=66 30.2x+2y=22 7x+2y=473X+5X=48
6*5+2X=4420X-50=50
32-22X=1024-3X=3
10X*（5+1）=60
99X=100-XX+3=18
56-2X=204y+2=6
3x+6=18 16+8x=40
4x-3*9=298x-3x=105
x+5=72x+3=10
6x+18=4856x-50x=30
78-5x=2832y-29=3
89x-9=80100-20x=20
55x-25x=60
76y-75=123y-23=23
80y+20=10053x-90=16
12y-12=2480+5x=100
65x+35=10019y+y=40
79y+y=8042x+28x=140
90y-90=9080y-90=70
78y+2y=160
88-x=809-4x=1
65y-30=10051y-y=100
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a+b=2a-2b+203
第八章 二元一次方程组练习题1.下列方程中,是二元一次方程的是( )A.3x-2y=4z B.6xy+9=0 C.+4y=6 D.4x=2.下列方程组中,是二元一次方程组的是( )A.3.二元一次方程5a-11b=21 ( )A.有且只有一解 B.有无数解 C.无解 D.有且只有两解4.方程y=1-x与3x+2y=5的公共解是(...
a+b=2a-2b+2032
1.2x+9y=81 3x+y=34 2.9x+4y=35 8x+3y=30 3.7x+2y=52 7x+4y=62 4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2y=21 3x+5y=56 7.5x+7y=52 5x+2y=22...
1) 66x+17y=3967 25x+y=1200 答案：x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案：x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案：x=79 y=48 (4) 76x-66y=4082 30x-y=2940 ...
扫描下载二维码二元一次方程组计算题及答案要步骤答案
2x+9y=81 3x+y=34 9x+4y=35 8x+3y=30 7x+2y=52 7x+4y=62 4x+6y=54 9x+2y=87 2x+y=7 2x+5y=19 x+2y=21 3x+5y=56 5x+7y=52 5x+2y=22 5x+5y=65 7x+7y=203 8x+4y=56 x+4y=21 5x+7y=41 5x+8y=44 7x+5y=54 3x+4y=38 x+8y=15 4x+y=29 3x+6y=24 9x+5y=46 9x+2y=62 4x+3y=36 9x+4y=467x+4y=42 9x+7y=135 4x+y=41 3x+8y=51 x+6y=27 9x+3y=99 4x+7y=95 9x+2y=38 3x+6y=18 5x+5y=45 7x+9y=69 1）为前一个方程,2）为后一个方程.下同2x+9y=81 3x+y=34 1)*3-2)*2得：25y=243-68y=7,x=99x+4y=35 8x+3y=30 1)*3-2)*4得：-5x=105-120=-15x=3,y=27x+2y=52 7x+4y=62 2)-1)得：2y=10y=5,x=64x+6y=54 9x+2y=87 1)-2)*3得：-23x=54-261=-207x=9,y=32x+y=7 2x+5y=19 1)-2)得：-4y=-12y=3,x=2x+2y=21 3x+5y=56 1)*3-2)得：y=7,x=75x+7y=52 5x+2y=22 1)-2)得：5y=30,y=6,x=25x+5y=65 7x+7y=203 x+y=13,又,x+y=29无解8x+4y=56 x+4y=21 1)-2)得：7x=35x=5,y=45x+7y=41 5x+8y=44 2)-1)得：y=3,x=47x+5y=54 3x+4y=38 1)*4-2)*5得：13x=216-190=26x=2,y=8x+8y=15 4x+y=29 1)*4-2)得：31y=31y=1,x=73x+6y=24 9x+5y=46 1)*3-2)得：13y=72-46=26y=2,x=49x+2y=62 4x+3y=36 1)*3-2)*2得：19x=114x=6,y=49x+4y=467x+4y=42 1)-2)得：2x=4x=2,y=79x+7y=135 4x+y=41 1)-2)*7得：-19x=135-287=-152x=8,y=93x+8y=51 x+6y=27 1)-2)*3得：-10y=-30y=3,x=99x+3y=99 4x+7y=95 1)*7-2)*3得：51x=408x=8,y=99x+2y=38 3x+6y=18 1)*3-2)得：24x=96x=4,y=15x+5y=45 7x+9y=69 1)/5*7-2)得：-2y=-6y=3,x=6做这么多题,辛苦!+5分!
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66x+17y=3967 25x+y=1200 答案：x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案：x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案：x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案：x=98 y=51 (5) 67x+54y=8546 71x-y=5680 答案：x=80 y=59...
扫描下载二维码5x+8y=18,3x-y=7 那么2x+9y=?_百度知道
5x+8y=18,3x-y=7 那么2x+9y=?
提问者采纳
如果对你有帮助请及时采纳，多谢，更上一层楼，得到2x+9y=11祝你学习进步5x+8y=18（1）3x-y=7 （2）（1）-（2）！ (*^__^*) 不明白的再问
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按照你说的，真的成功了，好开心，谢谢你！
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谢谢！如果您认可我的回答！【数学之美】团队为您答题，祝你学习进步。请点击下面的【选为满意回答】按钮5x+8y=18
①。有不明白的可以追问,3x-y=7
②①-②得5x+8y-3x+y=18-7 所以2x+9y=11 很高兴为您解答
5x+8y=18 ·············13x-y=7··············21式减2式得：(5x+8y)-(3x-y)=18-7(5x-3x)＋(8y+y)=11即：2x+9y=11
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出门在外也不愁若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=_百度知道
若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
提问者采纳
2(3x-2y)-(x-y)+(-x+9y)=6x-4y-x+y-x+9y=4x+6y题目是错的，请核对题目。
昂。。。真的错了吖= =
2x+3y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
2(3x-2y)-(x-y)+(-x+9y)=6x-4y-x+y-x+9y=4x+6y=2(2x+3y)=2×2012=4024
提问者评价
太感谢了，真心有用
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(3x-2y)-(x-y)+(-x+9y)=2(3x-2y)-(x-y)+(-x+9y)=6x-4y-x+y-x+9y=4x+6y=......2（2x+3y）=2*..
2x+3y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)=
代数式的相关知识
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出门在外也不愁