计算[(3x-2y)²-(3x+2y)²+3x²y²]÷2xy
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算:(-7x²y)(2x²y-3xy³+xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:2x+2y分之3y + x²+xy分之2xy
计算[(3x-2y)²-(3x+2y)²+3x²y²]÷2xy
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算:【[2/(3x)-2/(x+y)×[(x+y/(3x)-x²-xy)]】÷(x-y)/x
计算:x²y-(2xy²-5x²y)+3xy²-y³
先化简在求值(x+y)²-(x-y)(x+y)-(xy)²÷(xy),其中x,y是方程组『3x+2y
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)