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X : 0,25 - X = 15,6
X × 4 - X = 15,6
X × (4 - 1) = 15,6
X × 3 = 15,6
X = 15,6 : 3
X = 5,2
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X : 0,1 - X : 4 - X × 3/4 = 2,25
X × 10 - X × 1/4 - X × 3/4 = 2,25
X × (10 - 1/4 - 3/4) = 2,25
X × 9 = 2,25
X = 2,25 : 9
X = 0,25
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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) \(\frac{4}{9}+\frac{9}{5}x=1\)
\(\frac{9}{5}x=\frac{9}{9}-\frac{4}{9}\)
\(\frac{9}{5}x=\frac{5}{9}\)
\(x=1\)
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Ta có : \(x\div0,1-x\div4-x\times\frac{3}{4}=2,25\)
\(\Leftrightarrow x\times10-x\times\frac{1}{4}-x\times\frac{3}{4}\)
\(\Rightarrow x\times\left(10-\frac{1}{4}-\frac{3}{4}\right)=2,25\)
\(\Rightarrow x\times9=2,25\)
\(\Rightarrow x=2,25\div9=0,25\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x:0,1+x:4-x\times\dfrac{3}{4}=2,85\)
\(\Rightarrow x\times10+x\times\dfrac{1}{4}-x\times\dfrac{3}{4}=\dfrac{57}{20}\)
\(\Rightarrow x\times\left(10+\dfrac{1}{4}-\dfrac{3}{4}\right)=\dfrac{57}{20}\)
\(\Rightarrow x\times\dfrac{19}{2}=\dfrac{57}{20}\)
\(\Rightarrow x=\dfrac{57}{20}\times\dfrac{2}{19}\)
\(\Rightarrow x=\dfrac{114}{380}\)
\(\Rightarrow x=\dfrac{3}{10}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) PT \(\Leftrightarrow x=\dfrac{6}{0,12}=50\)
Vậy \(x=50\)
b) PT \(\Leftrightarrow x=4\cdot2,5=10\)
Vậy \(x=10\)
c) PT \(\Leftrightarrow x=\dfrac{5,6}{4}=1,4\)
Vậy \(x=1,4\)
d) \(\Leftrightarrow x=\dfrac{\dfrac{2}{5}}{0,1}=4\)
Vậy \(x=4\)
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