2X²-8xy+8y² 4x³-4x²y-(x-y)

已知x²+y²-8x+6y+25=0,求（x-y+4xy/x-y）（x+y-4xy/x+y） (5.2x²y-3.4xy+8x³)+2(2.2xy-4x³-2.3x²y)其中 多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x&# 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² -2xy-4x²y+8三次方y 2x+y=0,求4x²+2xy(x+y)+y³ (-x-2y)(x²-2xy+4y²) -4x²y-8xy²+2x²y-3xy² 化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x 观察下列一串单项式的特点：-xy,2x²y,-4x³y,8x的4次方y,-16x的5次方y x²/xy-x/y 【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a（x