计算:3y/(2x+2y) +2xy/x²+xy
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计算:3y/(2x+2y) +2xy/x²+xy
3y/(2x+2y) +2xy/x²+xy
=3y/2(x+y)+2xy/x(x+y)
=3xy+4xy/2x(x+y)
=7xy/x+y
=3y/2(x+y)+2xy/x(x+y)
=3xy+4xy/2x(x+y)
=7xy/x+y
计算:(1).(-2xy²)*(3x²y)²
计算:3y/(2x+2y) +2xy/x²+xy
计算:3(2x²-3xy²)-2(2xy²-3x²y)
1-x²+2xy-y²
(x+y-2xy)(x+y-2)+(1-xy)²
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
因式分解 x²-3xy+2y²+x-2
|x+2y+3|+(2x+y)²=0求x²-xy+y²
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy