Đáp án + Giải thích các bước giải:
`a)` `1 × 2 × 3 × 4 × 5 + 52.`
Ta có`:` `1 × 2 × 3 × 4 × 5 \vdots 2` `(`Vì `2 × (1 × 3 × 4 × 5) \vdots 2``)`
`52 \vdots 2.`
`⇒ 1 × 2 × 3 × 4 × 5 + 52 \vdots 2.`
Vậy `1 × 2 × 3 × 4 × 5 + 52 \vdots 2.`
`b)` `1 × 2 × 3 × 4 × 5 - 75.`
Ta có`:` `1 × 2 × 3 × 4 × 5 \vdots 5` `(`Vì `5 × (1 × 2 × 3 × 4) \vdots 2``)`
`75` \vdots 5.`
`⇒ 1 × 2 × 3 × 4 × 5 - 75 \vdots 5.`
Vậy `1 × 2 × 3 × 4 × 5 - 75 \vdots 5.`
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