去掉下列各式中的括号(1)(a+b)-(c+d)(2)(a-b)-(c-d) (3)(a+b)-(-c+d) (4)-[a-(b-c)]

问题描述:

去掉下列各式中的括号(1)(a+b)-(c+d)(2)(a-b)-(c-d) (3)(a+b)-(-c+d) (4)-[a-(b-c)]
化简:-4x+3(3分之1x-2)0-(x-y-z)

(1)(a+b)-(c+d)
=a+b-c-d
(2)(a-b)-(c-d)
=a-b-c+d
(3)(a+b)-(-c+d)
=a+b+c-d
(4)-[a-(b-c)]
=-[a-b+c]
=-a+b-c
化简:-4x+3(3分之1x-2)
=-4x+x-6
=-3x-6
0-(x-y-z)
=-x+y+z