Срочно Срочно Срочно !!!!!!!!!!!!!!!!!!​

Ответ:

1) 3a+3(1+a) = 3a+3+3a = 6a+3

2) 12x*3y*5z = 180xyz

3) 10(k+13t)+2(t+2k+6t)*3 = 10k+130t+6t+12k+36t = 22k+172t

4) 5(m+3n)+2(2m+n) = 5m+15n+4m+2n = 9m1+7n