1.x³-x²y-xy²+y³ 2.y²-2y-15 3.已知a+b=
1.x³-x²y-xy²+y³ 2.y²-2y-15 3.已知a+b=
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
已知x+y=2,xy=1/2,求x³y+2x²y²+xy³
已知集合A={(x,y)|x²+y²≤1.x.y∈R},B={(x,y)||x|+|y|≤2.x.y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
1.设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,
1.设A=2x²-3xy+y²+x-3y,B=4x²-6xy+2y²+4x-y,
已知:A=2x²-3x²y-2xy²,B=x²-2xy²+y³
已知A=2x²+3xy-y²,B=-1/2xy,C=1/8x³y³-1/4x