Question

Сократите пожалуйста: 1)(4m+n)-(3m-n)=
2)4b-(5b-(b-7))= 3)(m-n)-(m+n)-(m-n)=

Answer 1

1) ...= 4m+n-3m+n=m+2n
2) ...= 4b -5b + (b-7)= -b + b-7 = -7
3) ...= m-n-m-n-m+n= -m-n