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\(2.17.12+4.6.21+8.3.62\)
\(=24.17+24.21+24.62\)
\(=24\left(17+21+62\right)\)
\(=24.100\)
\(=2400\)
\(37.24+37.76+63.79+63.21\)
\(=37\left(27+76\right)+63\left(79+21\right)\)
\(=37.100+63.100\)
\(=3700+6300\)
\(=10000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 + 2 + 3 + 4 + ..... + 49 + 50(có 50 số hạng)
=51 × 25 = 1275
2 . 17 . 12 + 4 . 6 . 21 + 8 . 3 . 62
= 24 . 17 + 24 . 21 + 24 . 62
= 24 . ( 17 + 21 + 62 )
= 24 . 100 = 2400
37 . 24 + 37 . 76 + 63 . 79 + 63 . 21
= 37 . (24 + 76) + 63 . (79 + 21)
= 37 . 100 + 63 . 100
= (37 + 63 ) . 100
= 100 . 100 = 10000
2020 . 43 + 2020 . 56 + 2020
= 2020 . 43 + 2020 . 56 + 2020 . 1
= 2020 . ( 43 + 56 + 1 )
= 2020 . 100 = 202000
![](https://rs.olm.vn/images/avt/0.png?1311)
2.17.12+2.6.12+8.3.62
=24.17+24.6+24.62
=24.(17+6+62)
=24.85
=2040
\(2.17.12+2.16.12+8.3.62\)
\(=24.17+24.6+24.62\)
\(=24.\left(17+6+62\right)\)
\(=24.85\)
\(=2040\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2.17.12+4.6.21+62.8.3
= 2.12.17 + 24.12+62.24
= 24.17+24.12+62.24
Đến đây thì bn biết rồi đk.k nha
2.17.12 + 4.6.21 + 62.8.3
= 24.17 + 24.21 + 24 . 62
= 24. (17 + 21 + 62)
= 24 . 100
= 2400
![](https://rs.olm.vn/images/avt/0.png?1311)
=408+504+1488
=2400
2.17.12=408
4.6.21=504
8.3.62=1488
2.17.12+4.6.21+8.3.62=408+504+1488=2400
K nhé MN????????
HOk tốt!!!!!!