Tìm số tự nhiên x

T

thangvegeta1604

2) 71+ 52,5 x 4 = $\dfrac{x+140}{x}$ + 210
\Rightarrow $\dfrac{x+140}{x}$+210=281.
\Rightarrow $\dfrac{x+140}{x}$=71.
\Rightarrow 71x=x+140.
\Rightarrow x=2.
 
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