10.6 :x+7.19:X=3
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NH
9 tháng 1 2023
10.6 : x + 7.19 : x = 3
(10,6+7,19):x=3
17,79:x=3
x=17,79:3
x=5,93
7 : x - 3.9 : x = 5
(7-3,9):x=5
3,1:x=5
x=3,1:5
x=0,62
HP
0
HM
27 tháng 11 2017
Tìm x chứ gì :
X * 2,6 + X * 6,4 + X = 10,6
X * [ 2,6 + 6,4 + 1 ] = 10,6
X * 10 = 10,6
X = 10,6 : 10
X = 1,06
NHỚ K MÌNH NHÉ !!!!!!!!!!
NN
1
24 tháng 12 2021
a: \(=\dfrac{3}{7}\cdot\dfrac{7}{5}=\dfrac{3}{5}\)
b: \(=\dfrac{1}{5}+\dfrac{1}{9}=\dfrac{14}{45}\)
TN
2
5 tháng 4 2019
\(\frac{7}{4}-\left(\frac{1}{2.2}+\frac{1}{4.3}+\frac{1}{6.4}+\frac{1}{8.5}+\frac{1}{10.6}+\frac{1}{12.7}+\frac{1}{14.8}\right)\div x=0\)
\((\frac{1}{2.2}+\frac{1}{4.3}+\frac{1}{6.4}+\frac{1}{8.5}+\frac{1}{10.6}+\frac{1}{12.7}+\frac{1}{14.8})\div x=\frac{7}{4}\)
\((\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+\frac{1}{40}+\frac{1}{60}+\frac{1}{84}+\frac{1}{112})\div x=\frac{7}{4}\)
\(\left[\frac{1}{2}\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}\right)\right]\div x=\frac{7}{4}\)
\(\left[\frac{1}{2}\left(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}\right)\right]\div x=\frac{7}{4}\)
\(\left[\frac{1}{2}\left(1-\frac{1}{8}\right)\right]\div x=\frac{7}{4}\)
\(\left(\frac{1}{2}.\frac{7}{8}\right)\div x=\frac{7}{4}\)
\(\frac{7}{16}\div x=\frac{7}{4}\)
\(x=\frac{7}{16}\div\frac{7}{4}\)
\(x=\frac{7}{16}\times\frac{4}{7}\)
\(x=\frac{1}{4}\)
5 tháng 4 2019
\(\frac{7}{4}-\left(\frac{1}{2\cdot2}+\frac{1}{4\cdot3}+\frac{1}{6\cdot4}+\frac{1}{8\cdot5}+\frac{1}{10\cdot6}+\frac{1}{12\cdot7}+\frac{1}{14\cdot8}\right)\)
\(=\frac{7}{4}-\left(\frac{1}{4}+\frac{1}{12}+\frac{1}{24}+\frac{1}{40}+\frac{1}{60}+\frac{1}{84}+\frac{1}{112}\right)\)
\(=\frac{7}{4}-\frac{1}{2}\left(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}\right)\)
\(=\frac{7}{4}-\frac{1}{2}\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}+\frac{1}{6\cdot7}+\frac{1}{7\cdot8}\right)\)
\(=\frac{7}{4}-\frac{1}{2}\left(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}\right)\)
\(=\frac{7}{4}-\frac{1}{2}\left(1-\frac{1}{8}\right)\)
\(=\frac{7}{4}-\frac{1}{2}\cdot\frac{7}{8}\)
\(=\frac{7}{4}-\frac{7}{16}=\frac{28}{16}-\frac{7}{16}=\frac{21}{16}\)
27 tháng 12 2018
\(19\times5+7\times19+12-18\times12\)
\(=19\left(5+7\right)+12\left(1-18\right)\)
\(=19\times12+12\times\left(-17\right)\)
\(=12\left[19+\left(-17\right)\right]\)
\(=12\times2=24\)
27 tháng 12 2018
19.5+7.19+12-18.12=19(5+7) +12(1-18)
=19.12+12(-17)
=12(19-17)
=12.2=24
10,6 : x + 7,19 : x = 3
( 10,6 + 7,19 ) : x = 3
17,79 : x = 3
x = 17,79 : 3
x = 5,93
x=5,93 nha