(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
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(x/x+y+2y/x+y)乘以xy/x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+x^2/2y^2除以2y^2/x(x/x+y+2y/x+y)乘以xy/x+2y除以(1/
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)
=(x+2y)/(x+y)*xy/(x+2y)/[(x+y)/(xy)]
=xy/(x+y)*xy/(x+y)
=(xy)^2/(x+y)^2
（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
=9x^4/16y^2*2y/3x+x^2/2y^2*x/2y^2
=3x^3/8y+x^3/4y^4
=(3x^3y^3+2x^3)/8y^4
(x/y)^2乘以(xy)^-2除以(x^-1y)
XY（XY-X2)乘以------------X-Y
（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?
(xy^2-2xy+x)乘以y^3-y分之y^3+y^2
x^2y-x^3/x^2+2xy+y^2÷x/x-y乘以x+y/x^2-2xy+y^2
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)（2）（3x^2/4y)^2乘以2y/3x+ x^2/2y^2除以2y^2/x
(X-3Y)乘以(-3XY)=
（xy-x²）除以xy分之x²-2xy+y²乘以x²分之x-y
计算(xy-x²) 乘以 xy/x-y
(xy-x平方)乘以x-y份之xy=?
已知x=y=11,求(xy-1)的平方+（x+y-2)乘以(x+y-2xy)
1/5x的平方y乘以(-5xy)平方-(-2x)立方乘以xy立方
xy分之x^2-y^2乘以x-y分之x等于
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
化简：（根号x+根号y）分之(x+y） +【根号xy乘以（根号x+根号y）】 分之2xy还有一题：根号（xy） -根号（x/y）+根号（y/x)+根号（x/y+y/x+2)
X-Y/2X+2Y XY/X+Y²