化简(2x-3y)-3(4x-2y) a-(2a+b)+2(a-2b) 2(x-3y)-3(4x-2y) 1-(2a-1)-(3a+3) 2a-3b+[4a-(3a-b)]

(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(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:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简:5(x-y)+2(x+y)-3(x-y) 化简3(x-y)-7(x--y)+2(y-x) 化简：2x-{-3y+[4x-(3x-y]} （3a^3/X+Y)^3*(X^2-Y^2)除以（Y-X/Y+X)^2 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 1/(x-y)+1/(x+y)+2x/(x^2+y^2)+4x^3/(x^4+y^4)化简 化简(X-2Y)-(Y-3X) (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) [1]a(x-2y)-b(2y-x)+d(2x-4y) [2]x平方-2xy+y平方-2x+2y+1 【3】一（a-x)(a-y）-x(y-a)(X-a)[1]a(x-2y)-b(2y-x)+d(2x-4y) [2]x平方-2xy+y平方-2x+2y+1【3】一（a-x)(a-y）-x(y-a)(X-a) 分解因式,急求!