b+(c-d) = b+c-d
b-(-c-d) = b+c+d
(a+b)-(-c-d) = a+b+c+d
-(a+b)+(-c-d) = -a-b+c+d
-(a-b)-(c+d) = -a+b-c-d
Ответ: 1. b+c-d 2. b+c+d 3. a+b+c+d 4. -a-b+c+d 5. -a+b-c-d
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b+(c-d) = b+c-d
b-(-c-d) = b+c+d
(a+b)-(-c-d) = a+b+c+d
-(a+b)+(-c-d) = -a-b+c+d
-(a-b)-(c+d) = -a+b-c-d
Ответ: 1. b+c-d 2. b+c+d 3. a+b+c+d 4. -a-b+c+d 5. -a+b-c-d