Đáp án+Giải thích các bước giải:
`123 = 100 + 20 + 3 `
`= 100 + 10 + 10 + 1 + 1 + 1`
`= 10^2 + 10^1 + 10^1 + 10^0 + 10^0 + 10^0`
`134 = 100 + 30 + 4`
`= 100 + 10 + 10 + 10 + 1 + 1 + 1 + 1`
`= 10^2 + 10^ 1 + 10^1 + 10^1 + 10^0 + 10^0 + 10^0 + 10^0`
`2355 = 2000 + 300 + 50 + 5`
`= 1000 + 1000 + 100 + 100 + 100 + 10 + 10 + 10 + 10 + 10 + 1 + 1 + 1 + 1 + 1`
`= 10^3 + 10^3 + 10^2 + 10^2 + 10^2 + 10^1 + 10^1 + 10^1 + 10^1 + 10^1 + 10^0 + 10^0 + 10^0 + 10^0 + 10^0`
`9876 = 9000 + 800 + 70 + 6`
`= 1000 + 1000 + 1000 + 1000 + 1000 + 1000 + 1000 + 1000 + 1000 + 100 + 100 + 100 + 100 + 100 + 100 + 100 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 1 + 1 + 1 + 1 + 1 + 1`
`= 10^3 + 10^3 + 10^3 + 10^3 + 10^3 + 10^3 + 10^3 + 10^3 + 10^3 + 10^2 + 10^2 + 10^2 + 10^2 + 10^2 + 10^2 + 10^2 + 10^2 + 10^1 + 10^1 + 10^1 + 10^1 + 10^1 + 10^1 + 10^1 + 10^0 + 10^0 + 10^0 + 10^0 + 10^0 + 10^0`