(3/4x²-1/3xy²+1/2x²y-2/5y³)+(y³+1/2
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a(x
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
x四次方+x³-3x²-4x-4 x(x-1)+y(y+1)-2xy (x-2)³-(y-
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
(-2/3X³y+4x²y²-1/2xy²)/(-xy/4) 急
因式分解(1) 3x²+6xy(2)x³y-2x²y²+xy³
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x