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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
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: \(=\dfrac{3}{8}\left(\dfrac{3}{7}+\dfrac{4}{7}\right)+\dfrac{11}{8}=\dfrac{3}{8}+\dfrac{11}{8}=\dfrac{14}{8}=\dfrac{7}{4}\)
\(2016-100.\left(x+11\right)=2^7:2^3\)
\(\Rightarrow\) \(2016-100.\left(x+11\right)=2^4\)
\(\Rightarrow\) \(2016-100.\left(x+11\right)=64\)
\(\Rightarrow\) \(100.\left(x+11\right)=1952\)
\(\Rightarrow\) \(x+11=19,52\)
\(\Rightarrow\) \(x=8,52\)
Study well ! >_<
\(2016-100.\left(x+11\right)=2^7:2^3\)
=> \(2016-100.\left(x+11\right)=2^{7-3}\)
=>\(2016-100.\left(x+11\right)=2^4\)
=> \(2016-100.\left(x+11\right)=16\)
=>\(100.\left(x+11\right)=2016-16=2000\)
=> \(x+11=2000:100=20\)
=> \(x=20-11=9\)
Vậy \(x=9\)
Bài làm :
\(a,53.11+79.101\)
\(=583+7979\)
\(=8562\)
\(b,45.22+55.23\)
\(=9.5.11.2+55.23\)
\(=55.\left(18+23\right)\)
\(=55.41\)
\(=2255\)
\(c,27.332+68.27+73.332+68.73\)
\(=332.\left(27+73\right)+68.\left(27+73\right)\)
\(=\left(332+68\right).\left(27+73\right)\)
\(=400.100\)
\(=40000\)
Học tốt
-27 . 36 + 64 . -27 + 23 . -100
= -27 . (36 + 64) + 23 . -100
= - 27 . 100 + 23 . -100
= -100 . (27 + 23)
= -100 . 50
= - 5000
-27.36+64.(-27)+23(-100)
=-27.(36+64)+23(-100)
=-27.100+(-23).100
=100.[(-27)+(-23)]
=100.(-50)
=-5000
?? .......fmdnfhxvfvhzyv fhddddgnfhgmjvhnjghytdthtanththnghng nhng
2016 - 100 . (x +11)= 27 :23
2016 - 100 . (x +11)= 24
2016 - 100 . (x +11)=16
100 . (x +11)= 2016 - 16
100 . (x +11)= 2000
x + 11 = 2000 : 100
x + 11 = 20
x = 20 - 11
x = 9
(=) 2016 - 100x + 1100 = 16
(=) -100x = 16 - 2016 - 1100
(=) -100x = -3100
(=) x = -3100 : (-100)
(=) x = 31