(4x-2y-3)(4x+3+2y) 化简

(x+3y-4)(2x-y) 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 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) 化简(2x^3y^3+x^4y^2+x^2y^4)^2-x^2y^2(x+y)^2,x=2012,y=-2011 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 (2x-y)(2x+y)-2(3x-4y)(4y+3x) （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) (x-3y)(y+2x)-(4y-3x)(3x+4y)计算 计算【3(x-y)^2(x+y)^-2/4(x+y)^2(x-y)^-2】^-2 计算（2x-3y)(x+4y)-(3x+y)(x-2y)