Question

\(\dfrac{2}{5}\)x\(\dfrac{1}{x}\)+\(\dfrac{1}{x}\)x\(2\)+\(\dfrac{2}{5}\)=0,5
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Answer 1

Lời giải:

$\frac{2}{5}\times \frac{1}{x}+\frac{1}{x}\times 2+\frac{2}{5}=0,5$

$\frac{1}{x}\times (\frac{2}{5}+2)+0,4=0,5$
$\frac{1}{x}\times 2,4=0,1$

$\frac{1}{x}=0,1:2,4=\frac{1}{24}$

$\Rightarrow x=24$