Không thực hiện phép tính hãy CMR: $51 ·1625$ $\vdots$ $15$ $144+216+18$ $\vdots$ $9$ $20 ·31+80+35 ·77$ $\vdots$ $5$

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Không thực hiện phép tính hãy CMR:
$51 ·1625$ $\vdots$ $15$
$144+216+18$ $\vdots$ $9$
$20 ·31+80+35 ·77$ $\vdots$ $5$

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    Ta có : `51.1625`

    `=17. 3. 325 . 5`

    `= 15. 17. 325`

    Vì `15` $\vdots$ `15` nên ` 15. 17. 325` $\vdots$ `15`  

    `⇒51.1625\vdots 15`

    —————————————————————-

    `144+216+18`

    `=16.9+24.9+2.9`

    `=9(16+24+2)` 

    Vì `9\vdots9` nên `9(16+24+2)\vdots9` 

    `⇒144+216+18\vdots9`

    ———————————————————-

    `20.31+80+35.77`

    `=4.5.31+16.5+5.7.77`

    `=5(4.31+16+7.77)`

    Vì  `5\vdots5` nên `5(4.31+16+7.77)\vdots5`

    `⇒20.31+80+35.77\vdots5`

     

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