Question

Упростите ворожение, раскрыв скобки

(3m-4n)+(5m+3n)+n-7m=
15b-(3b-11)+(5-12b)=
5+3(2y-7)=

Answer 1

1. (3m-4n)+(5m+3n)+n-7m
3m-4n+5m+3n+n-7m
3m+5m-7m=m
-4n+3n+n=1

2. 15b-(3b-11)+(5-12b)
15b-3b+11+5-12b
15b-3b-12b=1
11+5=16

3. 5+3(2y-7)
5+6y+21
5+21=26