1)3b(a-b)= 2)-5(0,8c-0,9d)= 3)-1(3x-4y)= 9 4)7m(m-n-p)= 5)-0,3c(-5a-3c-2d)= 6)5(-4x-6y-3)= 12

3b(a-b)=3ab-3b^2

-5(0.8c-0.9d)=-4c+4.5d

-1(3x-4y)=-3x+4y

7m(m-n-p)=7m^2-7mn-7mp

-0.3(-5a-3c-2d)=1.5a+0.9c+0.6d

5(-4x-6y-3)=-20x-30y-15