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x-40%.x=3,6
\(x-\frac{2}{5}x=\frac{18}{5}\)
\(x\left(1-\frac{2}{5}\right)=\frac{18}{5}\)
\(\frac{3}{5}x=\frac{18}{5}\)
\(x=\frac{18}{5}:\frac{3}{5}\)
\(x=6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
X - 40% x X = 3,6
X - \(\frac{40}{100}\) x X = 3,6
X x 1 - \(\frac{2}{5}\) x X = 3,6
X x ( 1 - \(\frac{2}{5}\) ) = 3,6
X x \(\frac{3}{5}=3,6\)
X = 3,6 : \(\frac{3}{5}\)
X = 3,6 x \(\frac{5}{3}\)
X = 6
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 40% = 3,6
x - 0,4 = 3,6
x = 3,6 + 0,4
x = 4
Vậy x = 4
x-40%=3,6
\(\Rightarrow x-\frac{2}{5}=\frac{18}{5}\Rightarrow x=\)4
30xX+X=52
\(\Rightarrow31xX=52\Rightarrow x=\frac{52}{31}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(a)\) \(5,67 \) \(\times \) \(2,5 \) \(\times\) \(0,4\)
\(= 5,67 \) \(\times \) \(( \) \(2,5 \) \(\times \) \(0,4 \) \() \)
\(= 5,67 \times 1 \)
\(= 5,67\)
\(b) \) \(1,47 \times 3,6 + 1,47 \times 6,4\)
\(= 1,47 \times ( 3,6 + 6,4 )\)
\(= 1,47 \times 10 \)
\(= 14,7\)
\(c) \) \(0,25 \times 0,68 \times 40 + 25,8 \times 1,02 - 25,8 \times 1,01\)
\(= 0,68 \times ( 0,25 \times 40 ) + 25,8 \times 1,02 - 25,8 \times 1,01\)
\(= 0,68 \times 1 + 25,8 \times ( 1,02 - 1,01 )\)
\(= 0,68 + 25,8 \times 0,01\)
\(= 0,68 + 0,258 \)
\(= 0,938\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)