若A=x³-3x²y+2xy²+3y³,B=x³-2x²y+
若A=x³-3x²y+2xy²+3y³,B=x³-2x²y+
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y 若|
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若│
x²+3y-xy-3x= x³-x²-x+= x²-1-2xy+y= a
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
1.设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,