-2x-{4x-2y-[3x-(2x+1)]-10},其中x=-3,y=2009

-2x-{4x-2y-[3x-(2x+1)]-10},其中x=-3,y=2009 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 （2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1, [(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3 先化简,再求值：[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2 化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1 [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 求值(x-2y)²-4(x-2y)+2(x-2y)²-3(x-2y),其中x=-1,y=2分之1 化简求值：(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1