-4x²分之y乘以3y通分

1/(x-y)=(x+y)/(x²-y²)(xy+y²)/(x²-y²)=(xy+y²)/(x²-y²)

2/xy=2(y-x)/xy(y-x)3y/(xy-x^2)=3y^2/xy(y-x)如果不懂,请追问,祝学习愉快!

原式=-3xy^2*144y^2/x^2*x^3/216y^6=-2*1/y^2=-2/y^2

最简公分母是2(x+y)²(x-y)/2x+2y=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)²xy/(x+y)²=2×xy/2(x+y)²=2

∵单项式-2x*4y与单项式2/3x*my²次数相同∴4+1=m+2∴m=3∴2/3x*my²×（-2x*4y）=2/3×（-1）*3×（-3）²×[-2×（-1）*4×

若是：①4x²-y²和②X/(3Y-6X),则公分母是3(y-6x)；若是：①1/(4x²-y²)和②X/(3Y-6X),①=1/[(2x-y)(2x+y)],

解最简公分母2(x+y)²,∴(x-y)/(2x+2y)=(x+y)(x-y)/2(x+y)²=(x²-y²)/2(x+y)²xy/(x+y)

是(x-y)分之(x+y)*(x+y)分之(x-y)如果是,那么：(x-y)分之(x+y)*(x+y)分之(x-y)=1

(8x^2/9y^2)*(3y/-4x)=-2x/3y不懂请追问,满意请采纳~再问：过程？？？？再答：就相当于（8x的平方除以-4x）乘以(3y除以9y的平方）=-2x乘以3y分之一=负的3y分之2x

x/(3y)的分母是3y3x/(2y²)的分母是2y²两个分式的最简公分母是6y²,通分：x/(3y)=x×2y/(3y×2y)=2xy/(6y²)3x/(2y

(x-y)/(x+y),x/(x²+xy)=1/(x+y),y/(x²-y²)=y/(x+y)(x-y)分母的最小公倍数是(x+y)(x-y)通分得：(x-y)/(x+y

3y与2y²的最简公分母是6y²3y分之x=x/(3y)=(2y×x)/(2y×3y)=(2xy)/(6y²)2y平方分之3x=3x/(2y²)=(3×3x)/

x+y分之x-y=（x-y）²/(x+y)(x-y)x-y分之x+y=(x+y)²/(x+y)(x-y)

解x/y=3∴x=3y∴(x²+xy)/y²=(9y²+3y²)/y²=12y²/y²=12最简公分母(x-1)²(x+

解(1)：最简公分母是6(x+5)3分之x=x/3=2x(x+5)/[6(x+5)]6分之1-x=(1-x)/6=(1-x)(x+5)/[6(x+5)]x+5分之x平方-x=(x²-x)/(

-8x的平方y的4次方乘以4y的6次方分之3x除以【-6z分之x的平方y】=-8x²y⁴×(3x/4y^6)×(-6z/x²y)=36xz/y【-2x分之y】的平方乘以

[1]y+2分之y的平方-6y+9除以[3-y]=（3-y)²/(y+2)×/(3-y)=(3-y)/(y+2)[2]x的立方分之x的平方y乘以[-y分之1]=x²y/x³

(4-x的平方)分之(x的平方-2x)=x(x-2)/-(x+2)(x-2)=-x/(x+2)通分（y-x)分之1=2(x+y)(y-x)分之2(x+y)与（2x+2y）分之1=2(x+y)(y-x)

(4x/z)-(5y/z)=-2……①(x/z)-(4y/z)=3……②方程②×4得,(4x/z)-(16y/z)=12……③①-③得,11y/z=-14,∴y/z=-14/11代入②得,(x/z)-

公分母是2(x+y）^2(x-y)/(2x+2y)=(x-y)*(x+y)/2(x+y)*(x+y)=(x^2-y^2)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2