先化简,再求值 3x2y-[2xy-2(xy-32
先化简,再求值 3x2y-[2xy-2(xy-32
化简求值①化简:4ab+8-2b2-9ab-6②先化简,再求值:已知3x2y-[2x2y-3(2xy-x2y)-xy],
先化简后求值:4x2y-[6xy-3(4xy-2)-x2y]+1,其中x=2,y=-12
化简求值:2(x2y+xy)-3(x2y-xy)-4x2y,其中x=-1,y=1.
先化简,后求值.[2x(x2y-xy2)+xy(xy-x2)]÷x2y,其中x=2013,y=2012.
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
2(x2y+xy)-3(x2y+xy)-4x2y其中x=-2,y=12
计算:3xy(x2y-xy2+xy)-xy2(2x2-3xy+2x)因式分解
先化简,再求值:2xy+x+3x
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
先化简,再求值:3xy²(-x²y+2x³y²)-4xy(-xy²)·
已知A=x3-2y3+3x2y+xy2-3xy+4,B=y3-x3-4x2y-3xy-3xy2+3,C=y3+x2y+2