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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
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
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
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
`16/27xx13/29+16/27xx14/29`
`=16/27xx(13/29+14/29)`
`=16/27xx27/29`
`=16/29`
`48/49+15/39-18/49+15/39`
`=(48/49-18/49)+(15/39+15/39)`
`=30/49+30/39`
`=880/637`
\(16\times9+18\times2=8\times2\times9+18\times2\)
\(=18\times\left(8+2\right)=18\times10=180\)
a) 11/12 x 9/19 - 22/24 x 6/19 + 11/12 x 16/19.
= 11/12 x 9/19 - 11/12 x 6/19 + 11/12 x 16/19.
=11/12 x ( 9/19 -6/19 + 16/19)
=11/12x 1
=11/12
mình biết câu a/ thôi
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
\(2020\times14+4040\times16+6060\times18\)
\(=2020\times14+2020\times2\times16+2020\times3\times18\)
\(=2020\times14+2020\times32+2020\times54\)
\(=2020\times\left(14+32+54\right)\)
\(=2020\times100\)
\(=202000\)