化简3x^2y+(2x-5x^2y)还有2x-（2-5x）,a-(2a-3b)+(3a-4b),8x+2y+2(5x-2y) (x^2-y^2)-4(2x^2-3y^2),-4(x+y)+3[2/3x-2y]+1

化简:5(x-y)+2(x+y)-3(x-y) 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简y(x+y)+(x+y)(x-y)-x^2 数学(x-y)^5*(y-x)^3*(x-y)^2谢谢 还有步骤! 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x 化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y) 计算：x(x-3y)(5x-2y)还有（x^2-3)(x^2+5) x(x-3y)乘y 化简3(x-y)-7(x--y)+2(y-x) 整体去括号；化简[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y) 整体去括号；[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y)化简 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简(X-2Y)-(Y-3X) x(x-y)2-(y-x)3 (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y)