试说明代数式x³y³-1/2x²y+y²-2x³y³+0.5
试说明代数式-(3x²y+10x³)+3x³6x³y+3x的值与x,y都无关
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
试说明代数式:—(3x²y+10x³)+3x³+6x³y+3x²y—(
(1)已知:x+y=5,x²+y²=13,求代数式x³y+2x²y²+
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
设x-2的绝对值+(y+1/4)平方=0,试求代数式x²(x²-xy+y)-x(x³-2x
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知:x+y=5,x²+y² =11,求代数式x³y-2x²y²+xy
(x-y)³+9(x-y)-6(x-y)²
(x-y)³(x-y)²(y-x)等于多少
试说明代数式 x³y³ - 1/2x²y + y² - 2x³y&su
当x=1/2,y=1/3时,求代数式-(x²+4y)-(x³-3y+2)+2(x³+1/2