Техномозг

Verified answer

1) 5(2+a) = 10+5a
2) -(5+b) = -5-b 
3) -(c-3) = -c+3
4) -0,4(6-x) = -2,4+x
5) -1,3(y+z) = -1,3y-1,3z
6) 9,1(10+t) = 91+9,1t