Первое. (n-5,8)-(4,9+n) . Второе. -2,4m(-3,2n)

1) (n-5.8)-(4.9+n)=n-5.8-4.9+n=2n-10.72) -2.4m(-3.2n)=7.68mn

В1(n– 5,8) – (4,9 + n)= n-5.8-4.9-n=-10.7B3 4,2 ∙(1 – х) = - 8,4      1-x=-2      x=3C2 60% - 42       100% - x    x= (100*42)/60= 700