3x³y³·(-1/3x²y)²+(-1/3x²一)³·27
3x³y³·(-1/3x²y)²+(-1/3x²一)³·27
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
(x-y)·2(x-y)²·3(x-y)³ 计算
运用乘法公式(x+y+1)(x+y-1)(2x-y-3)²(2x-y-3)³【(x+2)(x-2)】
x四次方+x³-3x²-4x-4 x(x-1)+y(y+1)-2xy (x-2)³-(y-
1/2 x²y·( )=2x³y-x²y²
[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
-12x³y⁴÷(-3x²y³)·(-1/3xy)
合并同类项:-6x²y-x+5x²y-2x+x³y+3x