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&#