初中的计算题x²-2(x²-xy+y²)+(-x²+3xy+2y²)
(2×y+x²-y²)-(x²-y²-3xy) 计算题,
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
有这样一道计算题:“计算(2x²-3x²y-2xy²)-(x²-2xy²
数学计算题(0.3x³+x²y-2xy²)-(0.5x³-2x²y+1
计算题:3xy²÷(6y²/x)(需要过程)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
五道去括号的计算题,1.-4(-a-b) 2.4(x²-2xy) 3.-3分之1(6x-4y²) 4
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
化简(3X²-XY+Y²)-5(X²-XY+2Y²)