Cứu emmmmmmmmmmmmmmm

$\text{JessicaLeonor}$

`1` `)`

a ) Để $\overline{7*41}$ $\vdots$ 9 thì 

( * + 7 + 4 + 1 ) $\vdots$ 9 hay

* + 12 $\vdots$ 9

`=>` * = 6

$\overline{7*41}$ = 7641

b ) Để $\overline{52*2}$ $\vdots$ 9 thì 

( * + 5 + 2 + 2 ) $\vdots$ 9 hay

* + 9 $\vdots$ 9 

`=>` * = 0 ; 9

$\overline{52*2}$ = 5202 ; 5292

c ) Để $\overline{1*82*}$ $\vdots$ 9 thì 

( * x 2 + 1 + 8 + 2 ) $\vdots$ 9 hay

( * x 2 + 11 ) $\vdots$ 9

`=>` * x 2 = 7 ; 16

Mà phải $\vdots$ 2

`=>` * x 2 = 16

`=>` * = 16 : 2 

`=>` * = 8

$\overline{1*82*}$ = 18828 .