36x²y-48xy² y(x-y)²-(y-x)³ 3ax²+6ax
36x²y-48xy² y(x-y)²-(y-x)³ 3ax²+6ax
使(ax²-2xy+y²)-(-ax²+bxy+2y²)=6x²-9x
(ax²-2xy+y²)-(-ax²+bxy+2y²)=8x²-7xy
ax^3y+axy^3-2ax²y² x²(x-y)+(y-x) 已知|3x+2y+3|+
分解因式:1.x³y³-2x²y²+xy 2.ax²+2a²
x²/xy-x/y
[-xy/(x-y)²]²×(y²-xy/x)³
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
【x(x²y²-xy)-y(x²-x³y)】÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
计算:(xy-x²)×x-y/xy
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)