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Dao Trong Luan 20/08/2017 at 16:39
x : 2 + x + x:3 + x: 4 = 25
=> x/2 + x/1 + x/3 + x/4 = 25
=> 6x/12 + 12x/12 + 4x/12 + 3x/12 = 15
=> \(\dfrac{6x+12x+3x+4x}{12}=25\)
\(\Rightarrow\dfrac{25x}{12}=25\)
=> 25x = 25.12
=> x = 12
minhquang selected this answer. -
\(\dfrac{x}{2}+x+\dfrac{x}{3}+\dfrac{x}{4}=x.\left(\dfrac{1}{2}+1+\dfrac{1}{3}+\dfrac{1}{4}\right)=25\)
\(\dfrac{x.25}{12}=25\)
=> x = 12
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Luffy xyz 123 20/08/2017 at 16:41
\(\dfrac{x}{2}+x+\dfrac{x}{3}+\dfrac{x}{4}=25\)
=> x .( \(\dfrac{1}{2}+1+\dfrac{1}{3}+\dfrac{1}{4}\)) = 25
=> x . \(\dfrac{25}{12}\)= 25
=> x = 25 : \(\dfrac{25}{12}\)
x = 12