怎么化简-2(x-3y) 3(2x-y)-4(2x 3y)?

怎么化简-2(x-3y) 3(2x-y)-4(2x 3y)? [3x^2-(x+y)(y-x)][2(-x-y)(y-x)+2x^2+3y^2]怎么化简? (-2x+6y)的平方-(3x+2y)(2x-3y)+(-9y)*4怎么化简 (x+y)(x-y)+3y^2怎么做? x²y+2xy-3y怎么化简 (x-y)(x+y)-(x-2y)(2x+y)请问怎么化简. 3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项 绝对值化简|x-y+1|-2|y-x-3|+|y-x|+5y (x+2y)(x-2y)+3(x-2y)=0这个要怎么化简, x(x-y)2-(y-x)3 化简求值(2x+3y)²-(2x+y)(2x-y) (2x+3y)平方-(2x+y)(2x-y) (X^3-2y^3-3X^3y)-(3X^3-3y^3-7X^2y)怎么化简 6X-3Y+4X-3Y=5 6X+2Y-3X-3Y=12 怎么化简? 2（X-Y)的平方-7（X-Y)的立方+3（y-x）的平方+（y-x）的立方.怎么化简? [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算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