Question

-5х-6(9-2х)=
3(7-а)-7(1-3а)=
(6х-8)-5х-(4-9х)=
3(2,1m-n)-0,9(7m+2n)=

Answer 1

Ответ:

1) -5х-54+12х

7х-54

2)21-3а-7+21а

14+18а

3) 6х-8-5х-4+9х

10х-12

4) 6,3m-3n-6,3m-1,8n

-4,8n