怎么化简-2(x-3y) 3(2x-y)-4(2x 3y)?

3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项 (-2x+6y)的平方-(3x+2y)(2x-3y)+(-9y)*4怎么化简 (x+3y-4)(2x-y) [3x^2-(x+y)(y-x)][2(-x-y)(y-x)+2x^2+3y^2]怎么化简? x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2 (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 【x-3y][x+y]-[x-2y][x +2y]-[x-y 有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【- 化简求值:2(x-2y)^2-4(x-2y)+(x-2y)^2-3(x-2y), 初二化简求值题[（5x+2y)(3x+2y)+(x+2y)(x-2y)]/4x,其中x=2,y=3