1/3ab^2c乘(-3/8ab)(一4/5a^2bc^3)的解

来源：蜘蛛抓取(WebSpider) 时间：2015-03-15 23:04 标签： a乘以非ab
1.-(2ab)^3+3ab×a^2b^2 2.(x^2y^3)^4+(-x)^8(y^6)^2 3.(-3a^2)^3×a^3+(-4a)^2a^7-(5a^3)^34.(ab^2)^3-(ab)^3×b^3要有过程_百度作业帮
1.-(2ab)^3+3ab×a^2b^2 2.(x^2y^3)^4+(-x)^8(y^6)^2 3.(-3a^2)^3×a^3+(-4a)^2a^7-(5a^3)^34.(ab^2)^3-(ab)^3×b^3要有过程
4.(ab^2)^3-(ab)^3×b^3要有过程
1.-(2ab)^3+3ab×a^2b^2 =-8a^3b^3+3a^3b^3=-5a^3b^32.(x^2y^3)^4+(-x)^8(y^6)^2=x^8y^12+x^8y^12=2x^8y^12 3.(-3a^2)^3×a^3+(-4a)^2a^7-(5a^3)^3=-27a^9+16a^9-125a^9=-136a^94.(ab^2)^3-(ab)^3×b^3=a^3b^6-a^3b^6=01.(5m^3n^2)/(3m)2.(6a^2b-5a^2c^2)/(-3a^2)3.(16x^4+4x^2+x)/x4.(3a^2b-2ab+2ab^2)/(ab)5.(-4a^3+6a^2b^3+3a^3b^3)/(-4a^2)6.(2/5mn^3-m^2n^2+1/6n^4)/(2/3n^2)7.(1/10xy^2+1/4y^2-1/2y)/(1/5y)8.[(x+1)(x+2)-2]/x_百度作业帮
1.(5m^3n^2)/(3m)2.(6a^2b-5a^2c^2)/(-3a^2)3.(16x^4+4x^2+x)/x4.(3a^2b-2ab+2ab^2)/(ab)5.(-4a^3+6a^2b^3+3a^3b^3)/(-4a^2)6.(2/5mn^3-m^2n^2+1/6n^4)/(2/3n^2)7.(1/10xy^2+1/4y^2-1/2y)/(1/5y)8.[(x+1)(x+2)-2]/x
2.(6a^2b-5a^2c^2)/(-3a^2)3.(16x^4+4x^2+x)/x4.(3a^2b-2ab+2ab^2)/(ab)5.(-4a^3+6a^2b^3+3a^3b^3)/(-4a^2)6.(2/5mn^3-m^2n^2+1/6n^4)/(2/3n^2)7.(1/10xy^2+1/4y^2-1/2y)/(1/5y)8.[(x+1)(x+2)-2]/x
1：(5m^3n^2)/(3m)=5m^2n^2/32:(6a^2b-5a^2c^2)/(-3a^2)=6a^2b/(-3a^2)-5a^2c^2/(-3a^2)=-2b+5c^2/33:.(16x^4+4x^2+x)/x=x(16x^3+4x+1)/x=16x^3+4x+14:.(3a^2b-2ab+2ab^2)/(ab)=3a^2b/ab-2ab/ab+2ab^2/ab=3a-2+2b5:.(-4a^3+6a^2b^3+3a^3b^3)/(-4a^2)=(-4a^3)/(-4a^2)+6a^2b^3/(-4a^2)+3a^3b^3/(-4a^2)=a-3b^3/2-3ab^3/46:.(2/5mn^3-m^2n^2+1/6n^4)/(2/3n^2)=2/5mn^3/(2/3n^2)-m^2n^2/(2/3n^2)+(1/6n^4)/(2/3n^2)=3mn/5-3m^2/2+n^2/47:.(1/10xy^2+1/4y^2-1/2y)/(1/5y)=1/10xy^2/(1/5y)+1/4y^2/(1/5y)-1/2y/(1/5y)=xy/2+5y/4-5/28:.[(x+1)(x+2)-2]/x=(x^2+3x+2-2)/x=(x^2+3x)/x=x(x+3)/x=x+3你来做一做，一定要认真哦（1）化简：-3（2x2-xy）+4（x2+xy-6）（2）化简：（5a2b-2ab2-3ab）-（2ab+5a2b-2ab2）（3）先化简，再求值：$\frac{1}{2}{m^2}n-[{\frac{3}{2}{m^2}n-（{3mn-{m^2}}）}]$，其中m=-1，n=-3（4）先化简，再求值：2（ab2+3b3-a2b）-（-2a2b+b3+ab2）-4b3，其中a=-2，b=$\frac{1}{2}$．
（1）（2）先去括号，然后再合并同类项；（3）（4）的关键是化简，过程同（1）（2），先去括号，然后合并同类项，要注意在去括号的过程中需注意符号的变化．化简后再代值求解．
（1）原式=-6x2+3xy+4x2+4xy-24=-2x2+7xy-24；（2）原式=5a2b-2ab2-3ab-2ab-5a2b+2ab2=-5ab；（3）原式=$\frac{1}{2}$m2n-（$\frac{3}{2}$m2n-3mn+m2）=$\frac{1}{2}$m2n-$\frac{3}{2}$m2n+3mn-m2=-m2n+3mn-m2；当m=-1，n=-3时，原式=-（-1）2×（-3）+3×（-1）×（-3）-（-1）2=3+9-1=11；（4）原式：2ab2+6b3-2a2b+2a2b-b3-ab2-4b3=ab2+b3当a=-2，b=$\frac{1}{2}$时，原式=（-2）×（$\frac{1}{2}$）2+（$\frac{1}{2}$）3=$-\frac{1}{2}$+$\frac{1}{8}$=$-\frac{3}{8}$．约分(1)-4a^2bc^3/16abc^5 ,(2)2a^2(x-y)^3/a(y-x)(1)x^2-25/x^2-5x(2)a^2+4a+3/a^2+a-6(3)-32a^3b^2c/24a^2b^3d(4)-15(a+b)^2/-25(a+b)(5)a^2-ab/a-b(6)x^2-x-2/4-x^2_百度作业帮
约分(1)-4a^2bc^3/16abc^5 ,(2)2a^2(x-y)^3/a(y-x)(1)x^2-25/x^2-5x(2)a^2+4a+3/a^2+a-6(3)-32a^3b^2c/24a^2b^3d(4)-15(a+b)^2/-25(a+b)(5)a^2-ab/a-b(6)x^2-x-2/4-x^2
(1)x^2-25/x^2-5x(2)a^2+4a+3/a^2+a-6(3)-32a^3b^2c/24a^2b^3d(4)-15(a+b)^2/-25(a+b)(5)a^2-ab/a-b(6)x^2-x-2/4-x^2
(1)-4a^2bc^3/16abc^5=-a/4c²(2)2a^2(x-y)^3/a(y-x)=-2a（x-y）²(1)x^2-25/x^2-5x(2)a^2+4a+3/a^2+a-6=a²+5a-6(3)-32a^3b^2c/24a^2b^3d=-4ac/3bd(4)-15(a+b)^2/-25(a+b)=3(a+b)/5(5)a^2-ab/a-b=a²-2b(6)x^2-x-2/4-x^2=-x-1/2先化简,再求值:12(a^2b-1/3ab^2)+5(ab^2-a^2b)-4(1/2a^2b+3),其中,a=1/5,b=-5我算的-8,不对啊._百度作业帮
先化简,再求值:12(a^2b-1/3ab^2)+5(ab^2-a^2b)-4(1/2a^2b+3),其中,a=1/5,b=-5我算的-8,不对啊.
我算的-8,不对啊.
12(a^2b-1/3ab^2)+5(ab^2-a^2b)-4(1/2a^2b+3)=12a^2b-4ab^2+5ab^2-5a^2b-2a^2b-12=(12a^2b-5a^2b-2a^2b)+(5ab^2-4ab^2)-12=5a^2b+ab^2-12,其中,a=1/5,b=-5所以原式=5×1/5^2 ×（-5）+1/5×(-5)^2-12=-1+5-12=4-12=-8
化简即是合并同类项 12(a^2b-1/3ab^2)+5(ab^2-a^2b)-4(1/2a^2b+3)=12a²b-4ab²+5ab²-5a²b-2a²b-12=15a²b-9ab²-12=15(1/5)²x(-5)-9x1/5x(-5)²-12=-3-45-12=-60
化简即是合并同类项 12(a^2b-1/3ab^2)+5(ab^2-a^2b)-4(1/2a^2b+3)=12a²b-4ab²+5ab²-5a²b-2a²b-12=15a²b-9ab²-12=15(1/5)²x(-5)-9x1/5x(-5)²-12=-3-45-12=-60

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