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Tính nhanh
2020×28+74×2020-4040
= 2020 x 28 + 74 x 2020 - 2020 x 2
= 2020 x (28+74 - 2)
= 2020 x 100
= 202 000
![](https://rs.olm.vn/images/avt/0.png?1311)
2020 x 14 + 4040 x 16 + 6060 x 18
= 2020 x 14 + 2020 x 2 x 16 + 2020 x 3 x 18
= 2020 x 14 + 2020 x 32 + 2020 x 54
= 2020 x (14 + 32 + 54)
= 2020 x 100
= 202000
\(2020\times14+4040\times16+6060\times18\)
\(=2020\times14+2020\times2\times16+2020\times3\times18\)
\(=2020\times14+2020\times32+2020\times54\)
\(=2020\times\left(14+32+54\right)\)
\(=2020\times100\)
\(=202000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2070 + 414 x 4 x 28 - 138 x 3 x 17 = 41400
b) 2020 x 14 + 4040 x 16 + 6060 x 18 = 72720
c) 42 x 477 + 14 x 336 x 3 + 84 x 92 - 42 = 41832
![](https://rs.olm.vn/images/avt/0.png?1311)
2020*14+4040*16+6060*18
= 1010*2*14+1010*4*16+1010*6*18
=1010*28+1010*64+1010*108
=1010*(28+64+108)
=1010*200=202000
= 2020 * 14 + 2020 * 2 * 16 + 2020 * 3 * 18
= 2020 * 14 + 2020 * 32 + 2020 * 54
=2020 * (14 + 32 + 54)
=2020 * 100
=20200
![](https://rs.olm.vn/images/avt/0.png?1311)
=2000 x 2010 x 2020 x 2030 x 2040/2010 x 2020 x 2030 x 2040 x 2050
=2000/2050 = 40/41
Tí cậu gạch 2010;2020;2030;2040;2050 cả trên cả dưới nhé. Tớ ko biết ấn vào đâu để gạch
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2000/2010 x 2010/2000 x 2020/2030 x 2030/2040 x 2040/50
=1/1 x 1/1 x 202/203
=202/203
![](https://rs.olm.vn/images/avt/0.png?1311)
2020 x 16 + 2020 x 85 - 2020
= 2020x ( 16 + 85 -1 )
= 2020 x 100
=202000
![](https://rs.olm.vn/images/avt/0.png?1311)
= ( 2020 + 2020 ) + ( 2020 + 2020 ) - ( 2020 x 4 )
= 4040 + 4040 - 8080
= 8080 - 8080
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
18/15*35/36+18/15*15/18-18/15*20/72
5/6+1/1-1/3
5/6+6/6-2/6
3/2
dấu chấm là gì
nhân đấy trả lời giúp mình nha