去掉下列格式中的括号 (1)(a+b)+(c+d)= (2) (a-b)-(c-d)= (3) -(a+b)+(c-d)=

问题描述:

去掉下列格式中的括号 (1)(a+b)+(c+d)= (2) (a-b)-(c-d)= (3) -(a+b)+(c-d)=

2131131

(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

(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


(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