Раскройте скобки. 7 класс.
3m-(3m+(3m-(m+3)))
b-(2c-(3b+(4c-5b)))
1. 3m-(3m+(3m-m-3))= 3m-(3m+3m-m-3)= 3m+3m-m-3= 5m-3
2. b-(2c-(3b+4c-5b))= b-(2c-3b-4c+5c)= b -2c+3b+4c-5c=4b-3c
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Answers & Comments
1. 3m-(3m+(3m-m-3))= 3m-(3m+3m-m-3)= 3m+3m-m-3= 5m-3
2. b-(2c-(3b+4c-5b))= b-(2c-3b-4c+5c)= b -2c+3b+4c-5c=4b-3c