Раскрыть скобки: 31(4-z) 5(b+c+d) (5-25y)8

Question

Раскрыть скобки:
31(4-z)
5(b+c+d)
(5-25y)8

Answer 1

31(4-z) = 31*4-31*z = 124-31z
5(b+c+d) = 5*b+5*c+5*d = 5b+5c+5d
(5-25y)8 = 5*8-25y*8 = 40-200y

Answer 2

31*4+31*-z=124-31z
5*b+5*c+5*d=5b+5c+5d
8*5+8*(-25y)=40-200y