(+) ⋅ 7 = 20 ⋅ 7 + 8 ⋅ 7 = 28
(+) ⋅ 9 = 10 ⋅ 9 + 9 ⋅ 9 = 21
(40 + 6) ⋅= 40 ⋅ 8 + 6 = 40
По-мойму верно
(+) ⋅ 7 = 20 ⋅ 7 + 8 ⋅ 7 = 28
(+) ⋅ 9 = 10 ⋅ 9 + 9 ⋅ 9 = 21
(40 + 6) ⋅= 40 ⋅ 8 + 6 = 40
По-мойму верно