проверьте,верно ли выполнено раскрытие скобок:
1) -(-а-(-b+(-c))=a-b-c
2)-(a-((-b)-(-c))=-d-b+c
1) -(-а-(-b+(-c))=a-b-c
2)-(a-((-b)-(-c))=-d-b+c
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Answers & Comments
1) -b-c
2)-a+b+c
3) a-b-c
2.
1)-b+c
2)a+b-c
3)-a-b+c