-2x-[4x+2y-2(x+y)]其中x=-3,y=2003先化简再求值
问题描述:
-2x-[4x+2y-2(x+y)]其中x=-3,y=2003先化简再求值
化简后是不是等于-4x-4y?然后等于-8000?
答
-2x-[4x+2y-2(x+y)]
=-2x-[4x+2y-2x-2y]
=-2x-2x
=-4x
把x=-3代入得:-4x=12