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a) \(2+2+2+2+2=2\times5=10\)
\(2\times5=10\)
\(5+5=2\times5=10\)
\(5\times2=10\)
b) \(3\times5=3+3+3+3+3=15\)
\(5\times3=5+5+5=15\)
\(3\times5=5+5+5=15\)
\(5\times3=3+3+3+3+3=15\)
a) 2 + 2 + 2 + 2 + 2 = 10
2 x 5 = 10
5 + 5 = 10
5 x 2 = 10
b) 3 x 5 = 3 + 3 + 3 + 3 + 3 = 15
5 x 3 = 5 + 5 + 5 = 15
3 x 5 = 15
5 x 3 = 15
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 × 4 = 8 2 × 7 = 14 5 × 3 = 15 5 × 6 = 30
2 × 8 = 16 2 × 9 = 18 5 × 5 = 25 5 × 8 = 40
b) 12 : 2 = 6 18 : 2 = 9 15 : 5 = 3 30 : 5 = 6
16 : 2 = 8 14 : 2 = 7 20 : 5 = 4 45 : 5 = 9
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`687 + (2 × 5) + 10`
`= 687 + 10 + 10`
`= 697 + 10`
`= 707`
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![](https://rs.olm.vn/images/avt/0.png?1311)
2 × 4 = 8 4 × 2 = 8 2 × 10 = 20 |
3 × 5 = 15 5 × 3 =15 3 × 10 = 30 |
4 × 3 =12 3 × 4 = 12 4 × 10 = 40 |
5 × 2 = 10 2 × 5 = 10 5 × 10 = 50 |
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10
= 10 nha