先化简再求值-1/2x²×(2xy²-4x²y²)-4x²y×(-xy
先化简再求值-1/2x²×(2xy²-4x²y²)-4x²y×(-xy
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
数学:先化简再求值(x²+xy-2y²/x²-2xy+y²)-(1-xy
先化简再求值(x²+xy-2y²)/(x²-2xy+y²)
先化简,再求值.x²y²-4)(-x²y²-4)-4(xy-1/2)·(xy-1
初一数学先化简再求值:4x²y-[6xy-3(4xy-2)-x²y]+1,其中x=2,y=-1/2
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
化简求值:[(xy-2)²+4xy-4]÷(xy),其中x=10,y=1/25
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)其中
化简求值(x+y)(x-y)-(x-y)²-6x²y除2y+(2xy)²除(-4xy)其中