750. Какое из равенств верно:
1) -(-7) = 7;
3) + 9 = -(+9);
2) -(+9) = –9;
4) -(+11) = –11;
5) -8 = -(+8);
6) -(-32)
= 322
помогите пжл в письменном примером пошоговой обяснений​
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