通分x-y 2x 2y和xy (x y)的平方

x/(xy-y²)=x/[y(x-y)]y/(x²-xy)=y/[x(x-y)]∴公分母为：xy(x-y)通分后得x/(xy-y²)=x²/[xy(x-y)]y

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!

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

2xy/(x+y)²=2xy/((x+y)(x+y))x/(x²-y²)=x/((x+y)(x-y))所以公分母为(x+y)(x+y)(x-y)所以通分结果为：2xy/(

解（1）∵最简公分母是18x3y3，∴13xy3=6x23xy3•6x2=6x218x3y3，12x2y=9xy22x2y•9xy2=9xy218x3y3，19x3y=2y29x3y•2y2=2y21

通分1/x平方-y平方和1/x平方+xy1/x平方-y平方=x/x(x+y)(x-y)1/x平方+xy=(x-y)/x(x+y)(x-y)通分x/x平方-4和x-1/（x-2）平方x/x平方-4=x(

【参考答案】1、(2x+6y)/(x-3y)2、x/(x-9y²)3、1/(x²-6xy+9y²)观察三个分式的分母,确定最简公分母为(x+3y)(x-3y)²

x²-y²=(x+y)(x-y)所以最简公分母(x+y)²(x-y)所以2xy/(x+y)²=2xy(x-y)/(x+y)²(x-y)x/(x&sup

2xy/(x+y)的平方=2xy(x-y)/(x+y)²(x-y)x/x的平方-y的平方=x(x+y)/(x+y)²(x-y)

最简公分母是xy(x-y)∴2x+2y/x-y=xy(2x+2y)/xy(x-y)(x+y)²/xy=(x+y)²(x-y)/xy(x-y)再问：那么x-y/2x+2y与xy/（x

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

2xy/(x+y)^2和x/(x^2-y^2)2xy/(x+y)^2=2xy(x-y)/[(x+y)^2(x-y)]x/(x^2-y^2)=x(x+y)/[(x+y)^2(x-y)](x-y)/(2x

(x-y)/(2x+2y)=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)²=(x²-y²)/2(x+y)²xy/(x+y)²=2xy/

2x+2y=2(x+y)所以最简公分母是2(x+y)²所以(x-y)/(2x+2y)=(x+y)(x-y)/[2(x+y)²](xy)/（x+y）²=2xy/[2(x+y

第一个式子上下同乘x-y得2x平方y-2xy平方/（x+y)(x平方-y平方）第二个式子上下同乘x+y得x平方y/（x+y)(x平方-y平方）分母一样了

1/x²-y²=1/（X+Y）（X-Y）1/x²+xy=1/X（X+Y）通分1/x²-y²=X/X（X+Y）（X-Y）1/x²+xy=（X-

（x-y)/(2x+2y)=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2x-y/2x+2y=(x^2-y+4xy)/2x=(x^2-y

（x-y)/(2x+2y)=(x-y)/2(x+y)=(x-y)(x+y)/2(x+y)^2xy/(x+y)^2=2xy/2(x+y)^2x-y/2x+2y=(x^2-y+4xy)/2x=(x^2-y

2xy/(x+y)^2=2xy(x-y)/[(x-y)(x+y)^2]