(x+2y)².(2y+x)³+(-x-2y)^5=
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(3x-y)²-2x(4x-5y)-(x+2y)²
2(x-y)+3(x+y)2-5(x-y)-8(x+y)2-(x-y)
(x-y/x+2y)³
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,求4X/4X²-Y&
因式分解,5y(x-2y)²-20y(2x-y)²
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
1/2 x²y·( )=2x³y-x²y²