4xy-4x²-y²/2x-y÷(4x²-y²)
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(-x-2y)(x²-2xy+4y²)
1.化简:x²-4y²/x²+y²+2xy÷2y+x/x²+xy.
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x
(x²+2xy+y²分之x²-4y²)÷(x²+xy分之x+2y)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
已知2x+y=0,求x-2y/x²+xy乘(x²-y²)÷x²-4xy+4y
(x-6y)/(x²-4y²)+(2y)/(x²-2xy)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x