Раскройте скобки3m-(3m+(3m-(m+3)))

Question

Раскройте скобки
3m-(3m+(3m-(m+3)))

Answer 1

3м-(3м+(3м-(м+3)))=3м-(3м+(3м-м-3))=3м-(3м+(2м-3))=3м-(3м+2м-3)=3м-(5м-3)=3м-5м+3= 2м+3

Answer 2

3m- (3m+3m-m-3)= 3m -(5m-3) = 3m- 5m+3= 3-2m

Comments

откуда взял 5?