4) 5 ⋅ 106 + 5 ⋅ 105 + 5 ⋅ 104 + 5 ⋅ 103 + 5 ⋅ 102 + 5 ⋅ 10 + 5 = 5 ⋅ 1000000 + 5 ⋅ 100000 + 5 ⋅ 10000 + 5 ⋅ 1000 + 5 ⋅ 100 + 5 ⋅ 10 + 5 = 5000000 + 500000 + 50000 + 5000 + 500 + 50 + 5 = 5555555
Ответ: 5555555