giải : tìm x x = 5/7 x ( 44 + 2/3 x ( 44 + x ) )

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1. Tham khảo

   ` x=\frac{5}{7}.[44+\frac{2}{3}.(44+x)]`

   `⇒x=\frac{5}{7}.(44+\frac{88}{3}+\frac{2}{3}x)`

   `⇒x=\frac{220}{7}+\frac{440}{21}+\frac{10}{21}x`

   `⇒x-\frac{10}{21}x=\frac{1100}{21}`

   `⇒\frac{11}{21}x=\frac{1100}{21}`

   `⇒x=\frac{1100}{21}:\frac{11}{21}`

   `⇒x=100`

   `\text{©CBT}`

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