Question

1) 3(а+4)+а-3 =
2) 2(b+7)-3+(b+1)=
3) -0,15k×(-4m)×(-5)
помогите

Answer 1

1)3a+12+a-3=4a+9
2)2b+14-3+b+1=3b+12 или 3(b+4)
3)0,6mk*(-5)=-3mk