先化简 再求值 4x³-9xy²分之4x³y+12x²y²+9xy
先化简 再求值 4x³-9xy²分之4x³y+12x²y²+9xy
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
化简求值.(x-2y分之4xy 再加+x)除以4x³-x²y分之x²+4xy+4y
先化简,再求值:2x²-2y²分之4x²-8xy+4y²乘xy(x-y)分之(x
先化简再求值先化简再求值:4分之1x²y+3分之1x²y+3[-(9分之1x²y+xy)]
先化简,再求值 4(xy²+3xy-2x²y)-[12xy-3(3x²y-2xy²
先化简,在求值9x³-xy²/(3x+y)(9x²-6xy+y²)其中x=1,y
-3【y-(3x²-3xy)】-【y+2(4x²-4xy)】,其中=3,y=3分之1.先化简,再求值
先化简,再求值.x²y²-4)(-x²y²-4)-4(xy-1/2)·(xy-1
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a(x
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
先化简,再求值:3x³y²(-3xy³)-(-x²y³)(-x