解不定方程组x+y+z=100,10x+9y+z=300.(答案有解析最好.)_百度作业帮
解不定方程组x+y+z=100,10x+9y+z=300.(答案有解析最好.)
解不定方程组x+y+z=100,10x+9y+z=300.(答案有解析最好.)
Z=100-x-y10x+9y+100-x-y=3009x+8y=200设x=8t则y=25-9tz=75+t故解为x=8t y=25-9t z=75+t（t∈R）1.(x^2-5x)(x^2-5x-2)-242.(x^2+x)(x^2+x-3)+23.(x^2+3x)-2(x^2+3x+4)4.m^4+3m-m^3-35.2yz-y^2-z^2+x^26.x^2-x-9y^2-3y7.(1-a^2)(1-b^2)-4ab8.a^2n+1-b^2n-2a^n9.x^2-4xy+4y^2-10x+20y-2410.(z^2-x^2-y^2)^2-4x^2y^211.4a^2-4a-b^2+b+3/412.16(x+y)^4-72(x+y)^2+8113.2(_百度作业帮
1.(x^2-5x)(x^2-5x-2)-242.(x^2+x)(x^2+x-3)+23.(x^2+3x)-2(x^2+3x+4)4.m^4+3m-m^3-35.2yz-y^2-z^2+x^26.x^2-x-9y^2-3y7.(1-a^2)(1-b^2)-4ab8.a^2n+1-b^2n-2a^n9.x^2-4xy+4y^2-10x+20y-2410.(z^2-x^2-y^2)^2-4x^2y^211.4a^2-4a-b^2+b+3/412.16(x+y)^4-72(x+y)^2+8113.2(
1.(x^2-5x)(x^2-5x-2)-242.(x^2+x)(x^2+x-3)+23.(x^2+3x)-2(x^2+3x+4)4.m^4+3m-m^3-35.2yz-y^2-z^2+x^26.x^2-x-9y^2-3y7.(1-a^2)(1-b^2)-4ab8.a^2n+1-b^2n-2a^n9.x^2-4xy+4y^2-10x+20y-2410.(z^2-x^2-y^2)^2-4x^2y^211.4a^2-4a-b^2+b+3/412.16(x+y)^4-72(x+y)^2+8113.2(a^2+b^2)(a+b)^2-(a^2-b^2)^2
1.(x^2-5x)(x^2-5x-2)-24=(x^2-5x)²-2(x^2-5x)-24=（x^2-5x-6)(x^2-5x+4)=（x-6）（x+1）(x-1)(x-4)2.(x^2+x)(x^2+x-3)+2=(x^2+x)²-3(x^2+x)+2=(x^2+x-1)(x^2+x-2)=(x^2+x-1)(x+2）（x-1)3.(x^2+3x)²-2(x^2+3x+4) 这题前面的有平方吧=(x^2+3x)²-2(x^2+3x)-8=(x^2+3x-4)(x^2+3x+2)=（x+4）（x-1）（x+1）（x+2）4.m^4+3m-m^3-3=m³（m-1）+3（m-1）=（m-1）（m³+3）5.2yz-y^2-z^2+x^2=x²-（y-z）²=(x+y-z)(x-y+z)6.x^2-x-9y^2-3y=(x+3y)(x-3y)-(x+3y)=(x+3y)(x-3y-1)7.(1-a^2)(1-b^2)-4ab=1-a²-b²+a²b²-4ab=1-2ab+a²b²-2ab-a²-b²=（ab-1）²-（a+b）²=（ab-1+a+b）(ab-1-a-b)8.a^2n+1-b^2n-2a^n=(a^n-1)²-（b^n）²=(a^n-1+b^n)(a^n-1-b^n)9.x^2-4xy+4y^2-10x+20y-24=(x-2y)²-10(x-2y)-24=(x-2y-12)(x-2y+2)10.(z²-x²-y²)²-4x²y²=(z²-x²-y²+2xy)(z²-x²-y²-2xy)=[z²-(x-y)²][z²-(x+y)²]=(z+x-y)(z-x+y)(z+x+y)(z-x-y)11.4a^2-4a-b^2+b+3/4=(4a^2-4a+1)-1-b^2+b-1/4+1/4+3/4=(2a-1)²-(b-1/2)²=（2a-1+b-1/2）(2a-1-b+1/2)=（2a+b-3/2）(2a-b-1/2)12.16(x+y)^4-72(x+y)^2+81=[4(x+y)²-9]²=(2x+2y+3)²(2x+2y-3)²13.2(a²+b²)(a+b)²-(a²-b²)²=2(a²+b²)(a+b)²-(a+b)²（a-b）²=(a+b)²(2a²+2b²-a²-b²+2ab)=(a+b)²(a²+b²+2ab)=(a+b)²(a+b)²=(a+b)^4
如图，两张图分解因式的1、25x^2-10x+12、4a^4+12a^2b^2+9b^43、a^2b^2-ab-204、6ax+3ay-2bx-by5、x^2y^2-x^2-y^2+16、(x+1)(x+2)-x-107、a^2-2ab+b^2-3a+3b-108、9-a^2+4ab-4b^29、(x^2-x)^2-18(x^2-x)+7210、x^2-3xy-18y^2-3x-9y_百度作业帮
分解因式的1、25x^2-10x+12、4a^4+12a^2b^2+9b^43、a^2b^2-ab-204、6ax+3ay-2bx-by5、x^2y^2-x^2-y^2+16、(x+1)(x+2)-x-107、a^2-2ab+b^2-3a+3b-108、9-a^2+4ab-4b^29、(x^2-x)^2-18(x^2-x)+7210、x^2-3xy-18y^2-3x-9y
分解因式的1、25x^2-10x+12、4a^4+12a^2b^2+9b^43、a^2b^2-ab-204、6ax+3ay-2bx-by5、x^2y^2-x^2-y^2+16、(x+1)(x+2)-x-107、a^2-2ab+b^2-3a+3b-108、9-a^2+4ab-4b^29、(x^2-x)^2-18(x^2-x)+7210、x^2-3xy-18y^2-3x-9y
1.=（5X-1)^22.=(2a^2+3b^2)^23.=(ab-5)(ab+4)4.=3a(x+y)-b(2x+y)=(2x+y)(3a-b)5.x^2(y^2-1)-(y^2-1)=(x^2-1)(y^2-1)=(x+1)(x-1)(y+1)(y-1)6.=x^2+3x+2-x-10=x^2-2x-8=(x-4)(x+2)7.=(a-b)^2-3(a-b)-10=(a-b-5)(a-b+2)8.=9-(a-2b)^2=(3-a+2b)(3+a-2b)9.=(x^2-x-6)(x^2-x-12)=(x-3)(x+2)(x-4)(x+3)10.=(x-6y)(x+3y)-3(x+3y)=(x+3y)(x-6y-3)Y+9Y/3=?a*a+a*2=?10x*3+x=?_百度作业帮
Y+9Y/3=?a*a+a*2=?10x*3+x=?
Y+9Y/3=?a*a+a*2=?10x*3+x=?
Y+9Y/3=y＋3y=4ya*a+a*2=a(a＋2)10x*3+x=30x＋x=31x
Y+9Y/3=4Ya*a+a*2=a*(a+2)10x*3+x=31x
Y+9Y/3=y＋3y=4ya*a+a*2=a(a＋2)10x*3+x=30x＋x=31x因式分解1.(x-y)a-x+y 2.a²(a-b)+b²(b-a)3.2x³-16y³ 4.3y²+9y-125.5x²-13xy-6y² 6.x³-2x²-10x-207.-3x³-12x²+36x 8.9-x²+12xy-36y²9.9s(s-1)-2t(6s-2t-3) 10.6(m-n)²-10m+10n-411.-3y^4+10y_百度作业帮
因式分解1.(x-y)a-x+y 2.a²(a-b)+b²(b-a)3.2x³-16y³ 4.3y²+9y-125.5x²-13xy-6y² 6.x³-2x²-10x-207.-3x³-12x²+36x 8.9-x²+12xy-36y²9.9s(s-1)-2t(6s-2t-3) 10.6(m-n)²-10m+10n-411.-3y^4+10y
因式分解1.(x-y)a-x+y 2.a²(a-b)+b²(b-a)3.2x³-16y³ 4.3y²+9y-125.5x²-13xy-6y² 6.x³-2x²-10x-207.-3x³-12x²+36x 8.9-x²+12xy-36y²9.9s(s-1)-2t(6s-2t-3) 10.6(m-n)²-10m+10n-411.-3y^4+10y²+8 12.3x²y+28y²+7xy²+12xy13.(a²-b²)+3(a²-b²)-18 14.a²+2ab+b²-a-b15.(m²+3m)²-8(m²+3m)-20 16.4a²bc-3a²c²+8abc-6ac²17.(y²+3y)²-(2y+6)²
1、(x-y)a-x+y =(x-y)a-(x-y) =(x-y)(a-1) 2、a²(a-b)+b²(b-a) =a²(a-b)-b²(a-b) =(a-b)(a²-b²) =(a-b)(a-b)(a+b) =(a-b)²(a+b) 3、2x³-16y³ =2(x³-8y³)=2(x³-(2y)^3)=2(x-2y)(x²+4y^4+2xy)4、3y²+9y-12 =3(y²+3y-4)=3(y+4)(y-1)5、先解出方程5x²-13x-6=0的两根,为：x=3或-0.4于是有5x²-13xy-6y²=5(x-3)(x+0.4)7、-3x³-12x²+36x =-3x(x²+4x-12)=-3x(x+6)(x-2)自己做吧,第六题我怀疑是题目错了,第8、9、10题用待定系数法做
(x-y)a-x+y =(x-y)a-(x-y) =(x-y)(a-1)a²(a-b)+b²(b-a) =a²(a-b)-b²(a-b)=(a-b)(a²-b²)=(a-b)(a-b)(a+b)=(a-b)²(a+b)