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Haruma347
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2023-01-24 12:56:14
`a)`
Dãy số trên có `:`
`( 997 - 1 ) : 3 + 1 = 333` ( số )
Số hạng thứ 100 là `:`
`1 + 3 xx ( 100 - 1 ) = 299`
Đ/s : ....
2022-07-24 20:34:41
Do $361 = 19 \times 19$ nên cạnh hình vuông $=$ $19$ $dm$
Vậy ....
2022-07-24 20:32:52
$\overline{ab}$ $= ( a+ b ) \times 5$
$ 10 \times a + b = a \times 5 + b \times 5`
$ 5 \times a = b \times 4`
Do `a;b` là các số tự nhiên nên `a=4;b=5`
\(\Rightarrow\) $\overline{ab}$ $=45$
Vậy ....