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\(6\times\left(\frac{2}{5}\times x+3\right)=\frac{3}{5}\Rightarrow\frac{2}{5}\times x+3=\frac{3}{5}\div6\Rightarrow\frac{2}{5}\times x+3=\frac{1}{10}\)
\(\Rightarrow\frac{2}{5}\times x=\frac{1}{10}-3\Rightarrow\frac{2}{5}\times x=\frac{-29}{10}\Rightarrow x=\frac{-29}{4}=-7,25\)
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Bài 1
\(a,\)6 giờ 45 phút : 5 = 1 giờ 21 phút
\(b,\)12 giờ 36 phút : 12 = 1 giờ 3 phút
\(c,\)17,64 - ( 5 - 6,36 ) = 19
\(d,\)53,68 x 15,6 - 53,68 x 5,6 = 53,68( 15,6 - 5,6 ) = 536 , 8
Bài 2 :
\(b,\)\(x\times0,1=\frac{2}{5}\)
\(\Rightarrow x=\frac{2}{5}\div0,1\)
\(\Rightarrow x=4\)
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a.
150 + x : 3 = 620 : 4
150 + x : 3 = 155
x : 3 = 155 - 150
x : 3 = 5
x = 5 x 3
x = 15
b.
x * 0,1 = 1/2 -2/5
x * 1/10 = 5/10 - 4/10
x * 1/10 = 1/10
x = 1/10 : 1/10
x = 1
c.
4/9 + 5/9 : x = 1
5/9 : x = 1 - 4/9
5/9 :x = 5/9
x = 5/9 : 5/9
x = 1
1) \(150+x.\frac{1}{3}=155\)
\(\frac{1}{3}x=5\)
\(x=15\)
2) \(x.\frac{1}{10}=\frac{1}{2}-\frac{2}{5}\)
\(\frac{1}{10}x=\frac{5}{10}-\frac{4}{10}\)
\(\frac{1}{10}x=\frac{1}{10}\)
\(x=1\)
3) \(\frac{4}{9}+\frac{9}{5}x=1\)
\(\frac{9}{5}x=\frac{9}{9}-\frac{4}{9}\)
\(\frac{9}{5}x=\frac{5}{9}\)
\(x=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\Leftrightarrow x\cdot\dfrac{21}{2}=\dfrac{3}{7}\)
hay x=2/49
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a, \(\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot\frac{5}{6}=\frac{1\cdot2\cdot3\cdot4\cdot5}{2\cdot3\cdot4\cdot5\cdot6}=\frac{1}{6}\)
b, 10,3 x 37,5 - 37,5 x 10,2
= 37,5 x ( 10,3 - 10,2 )
= 37,5 x 0,1
= 3,75
a) \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\times\frac{5}{6}\)
\(=\frac{1\times2\times3\times4\times5}{2\times3\times4\times5\times6}\)
\(=\frac{1}{6}\)
b) 10,3 x 37,5 - 37,5 x 10,2
= 37,5 x ( 10,3 - 10,2 )
= 37,5 x 0,1
= 3,75
![](https://rs.olm.vn/images/avt/0.png?1311)
a)1/2:0,5-1/4:0,25+1/8:0,125-1/10:0,1
=1/2x2-1/4x4+1/8x8-1/10x10
=1-1+1-1
=0
b)không biết k 2 cái là dc rồi
\(a,\dfrac{1}{5}+\dfrac{1}{2}+\dfrac{3}{10}=\dfrac{2+5+3}{10}=\dfrac{10}{10}=1\\ 3+\dfrac{1}{3}+\dfrac{1}{2}+\dfrac{1}{6}=\dfrac{3\times6+2+3+1}{6}=4\\ Vậy:1< x< 4\\ Vậy:x=2.hoặc.x=3\)
\(b,1000\times0,1=100\\ 10,3:0,1=103\\ Vậy:100< x< 103\\ Vậy:x=101.hoặc.x=102\)