Tính nhanh:
2020 x 14 + 4040 x 16 + 6060 x 18
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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
18 x 7 + 18 x 16 – 18 x 14 + 18
= 18 x 7 + 18 x 16 – 18 x 14 + 18 x 1
= 18 x (7 + 16 – 14 + 1)
= 18 x 10
= 180
= 2020 x 0,56 + 0,34 x 3 x 2020 + 2020 x 4 x 0,85 + 2020 x 5,02
= 2020 x 0,56 + 1,02 x 2020 + 2020 x 3,4 + 2020 x 5,02
= 2020 x ( 0,56 + 1,02 + 3,4 + 5,02 )
= 2020 x ( 1,58 + 3,4 + 5,02 )
= 2020 x ( 4,98 + 5,02 )
= 2020 x 10
= 20202
------------------Hết------------------
Tính theo tính nhanh_________
20 200 |
2020 x 0,56 + 0,36 x 6060 + 8080 x 0,85 + 2020 x 5,02
=1131,2+2181,6+6868+10140,4
=20321,2
2020 x 0,56 +0,36x6060+8080x0,85+2020x5,02
=2020 x 0,56 +0,36x3x2020+4x2020x0,85+2020x5,02
=2020 x 0,56 +1,08x2020+3,4x2020+2020x5,02
=2020x(0,56+1,08+3,4+5,02)
= 2020x10,06
=20321.2
11 x 12 + 12 x 13 + 13 x 14 + 14 x 15 + 15 x 16 + 16 x 17 + 17 x 18 + 18 x 19 + 19 x 20 + 20 x 21
= 12 x ( 11 + 13 ) + 14 x ( 13 + 15 ) + 16 x ( 15 + 17 ) + 18 x ( 17 + 19 ) + 20 x 21
= 12 x 24 + 14 x 28 + 16 x 32 + 18 x 36 + 420
= 288 + 392 + 512 + 648 + 420
= ( 288 + 392 ) + ( 512 + 648 ) + 420
= 680 + 1160 + 420
= 1840 + 420
= 2260
tk nha
=
Ta có:
11 x 12 + 12 x 13 + 13 x 14 + 14 x 15 + 15 x 16 + 16 x 17 + 17 x 18 + 18 x 19 + 19 x 20 + 20 x 21
= 12 x ( 11 + 13 ) + 14 x ( 13 + 15 ) + 16 x ( 15 + 17 ) + 18 x ( 17 + 19 ) + 20 x 21
= 12 x 24 + 14 x 28 + 16 x 32 + 18 x 36 + 420
= 288 + 392 + 512 + 648 + 420
= ( 288 + 392 ) + ( 512 + 648 ) + 420
= 680 + 1160 + 420
= 1840 + 420
= 2260
#Mạt Mạt#
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
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
\(2020\times14+4040\times16+6060\times18\)
\(=2020\times14+2020\times2\times16+2020\times3\times18\)
\(=2020\times14+2020\times32+2020\times54\)
\(=2020\times\left(14+32+54\right)\)
\(=2020\times100\)
\(=202000\)