20210-{225 : [20.15-23.52 ] -25}
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a: 785+135-85+65
=785-85+135+65
=700+200
=900
b: \(32\cdot39+52\cdot21-12\cdot39+21\cdot48\)
\(=39\cdot32-12\cdot39+52\cdot21+21\cdot48\)
\(=39\left(32-12\right)+21\left(52+48\right)\)
\(=39\cdot20+21\cdot100=2100+780=2880\)
c: \(5^4\cdot5^8:5^9\cdot6\cdot8\cdot7\)
\(=\dfrac{5^{12}}{5^9}\cdot48\cdot7\)
\(=125\cdot48\cdot7=42000\)
d: \(2021^0-\left\{15^2:\left[175+\left(2^3\cdot5^2-6\cdot25\right)\right]\right\}\)
\(=1-\dfrac{225}{175+8\cdot25-150}\)
\(=1-\dfrac{225}{25+220}\)
=1-1
=0
a) 785 + 135 - 85 + 65 = 900
b) 32.39 + 52.21 - 12.39 + 21.48 = 93.69
c) 5 mũ 4.5 mũ 8 ÷ 5 mũ 9.6 ÷ 8.7 = 0.134
d) 2021 mũ 0 - { 15 mũ 2 : [ 175 + ( 2 mũ 3.5 mũ 2 - 6.25 ) ] } = 2021 mũ 0 - { 152 : [ 175 + 17.27 ] } = 20210 - { 152 : 192.27 } = 20210 - 0.791 = 20209.209
a) 25.69+31.25-25.6
= 25.(69+31-6)
= 25.94
= 2350
b) 198:[130-(27-19)2]+20210
= 198:[130-82]+1
= 198:(130-64)+1
= 198:66+1
= 3+1
= 4
c) 520:[515.(15+10)]
= 520:[515.25]
= 520:(515.52)
= 520: 517
= 53
a) \(64\left(57+43\right)-2300=64.100-2300=6400-2300=4100\)
a: =25x100-150=2500-150=2350
c: \(=520:\left\{515\cdot25\right\}\)
=104/2575
\(=600:\left\{450:\left[450-\left(500-200\right)\right]\right\}\)
\(=600:\left\{450:\left[450-300\right]\right\}\)
\(=600:3=200\)
=600:{450:[450-(4.125-8.25)]}
=600:{450:[450-(8.125-4.25)]}
=600:{450:[450-300]
=600:{450:150}
=600:3
=200
Lần sau bn nhớ ghi đúng thứ tự ngoặc nhé
(4x - 14)³ = 2³.5² + 800
(4x - 14)³ = 8.25 + 800
(4x - 14)³ = 1000
(4x - 14)³ = 10³
4x - 14 = 10
4x = 10 + 14
4x = 24
x = 24 : 4
x = 6
TL:
20210 - [225 : (20 . 15 - 23 . 52) - 25]
= 1 - [225 : (300 - 8 . 25) - 25]
= 1 - [225 : (300 - 200) - 25]
= 1 - [225 : 100 - 25]
= 1 - [2,35 - 25]
= 1 - (-22,65)
= 23,65
HT