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a) 2016 - 100.(x+31)=27:23
<=> 2016 - 100.(x+31) = 24 = 16
<=> 100.(x+31) = 2016 - 16 = 2000
<=> x+31 = 2000:100 = 20
<=> x = 20 - 31 = -11
b) (x+8)3 = 125
<=> (x+8)3 = 53
<=> x+8 = 5
<=> x = 5 - 8
<=> x = -3
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a. = 23 . (55-45) + 230
= 23 . 10 +230
= 230 + 230
= 460
b. = 71 . (66 - 41 - 1)
= 71 . 24
= 1704
c. = 50 . (11 + 22) - 100
= 50 . 33 - 100
= 1650 - 100
= 1550
d. = 27. (54 - 50) + 50
= 27 . 4 + 50
= 108 + 50
= 158
a) 23.55-45.23+230
=23.(55-45)+230
=23.10+230
=230+230
=460
b) 71.66-41.71-71
=71.(66-41-1)
=71.24
=1704
c) 11.50+50.22-100
=50.(11+22)-100
=50.33-100
=1550
d) 54.27-27.50+50
=27.(54-50)+50
=27.4+50
=108+50
=158
# Bé_Bông #
2: \(=\dfrac{-2}{75}+\dfrac{5}{39}=\dfrac{33}{325}\)
3: \(=\dfrac{6}{11}\left(\dfrac{4}{9}+\dfrac{5}{9}\right)=\dfrac{6}{11}\)
4: \(=\dfrac{7}{19}\left(\dfrac{5}{13}+\dfrac{8}{13}-1\right)=-2\cdot\dfrac{7}{19}=-\dfrac{14}{19}\)
5: \(=\dfrac{2}{7}\left(\dfrac{4}{23}-\dfrac{27}{23}+1\right)=0\)
6: \(=\dfrac{3}{8}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{11}{8}=\dfrac{3}{8}+\dfrac{11}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)
a. \(\left(27-x\right)\cdot2018=0\)
\(\left(27-x\right)=0\text{ : }2018\)
\(\left(27-x\right)=0\)
\(x=0+27\)
\(x=27\)
b. \(27\cdot x+23\cdot x=100\)
\(\left(27+23\right)\cdot x=100\)
\(50\cdot x=100\)
\(x=100\text{ : }50\)
\(x=2\)
a, (27-x).2018=0
27-x=0:2018
27-x=0
x=27-0
x=27
b,27.x+23.x=100
x.(27+23)=100
x.50=100
x=100:50
x=2
tk mk nha
\(a,2448:\left[119-\left(x-6\right)\right]=24\)
\(119-\left(x-6\right)=2448:24\)
\(119-\left(x-6\right)=102\)
\(x-6=119-102\)
\(x-6=17\)
\(x=17+6\)
\(\Rightarrow x=23\)
\(b,2016-100\times\left(x+11\right)=128:8\)
\(2016-100\times\left(x+11\right)=16\)
\(100\times\left(x+11\right)=2016-16\)
\(100\times\left(x+11\right)=2000\)
\(x+11=2000:100\)
\(x+11=20\)
\(x=20-11\)
\(\Rightarrow x=9\)
\(a,2448:\left[119-\left(x-6\right)\right]=24\\ 119-\left(x-6\right)=2448:24\\ 119-\left(x-6\right)=102\\ x-6=119-102\\ x-6=17\\ x=17+6\\ x=23\\ b,2016-100\times\left(x+11\right)=128:8\\ 2016-100\times\left(x+11\right)=16\\ 100\times\left(x+11\right)=2016-16\\ 100\times\left(x+11\right)=2000\\ x+11=2000:100\\ x+11=20\\ x=20-11\\ x=9\)
2016 - 100. (x+11)= \(2^7:2^3\)
<=> 2016 - 100 (x+11) = 16
<=> 100(x+11)= 2000
<=> x+11= 10
<=> x = -1
Vậy ...
2016-100.(x+11)=27 : 23
<=>2016 -100x-1100=24
<=>-100x=16+1100-2016
<=> -100x=-900
<=> x=9