$Đáp$ $án$ $+$ $Giải$ $thích$ $các$ $bước$ $giải$ $:$

$\color{#1c1c1c}{\text{@ki}}$$\color{#363636}{\text{n}}$$\color{#4f4f4f} {\text{g}}$$\color{#696969}{\text{m}}$$\color{#828282} {\text{a}}$$\color{#9c9c9c}{\text{t}}$$\color{#b5b5b5} {\text{hs}}$

$b)$ `10 xx 10 xx 10 xx 100`

`= 10 xx 10 xx 10 xx 10^2`

`= 10^{1+1+1+2}`

`= 10^5`

`to` Vậy số mũ là `color{red}{5}`