2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(xy-2y)(xy+2y)-(x-y)²-x²y² 其中x=5/2 y=- 3/5 先化
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
合并同类项并计算 -3[y-(3x²-3xy)]-[y+2(4x²-4xy)]其中,x=3,y=1/