` f. ( 2 5/11 – 3/22 : x ) . 2 1/5 = 4 1/5 `

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1. Mk tb tg hình

    

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2. `f. (2 5/11 – 3/22 : x) . 2 1/5 = 4 1/5`

   `⇒ (27/11 – 3/22 : x) . 11/5 = 21/5`

   `⇒ 27/11 – 3/22 : x = 21/5 : 11/5`

   `⇒ 27/11 – 3/22 : x = 21/5 . 5/11`

   `⇒ 27/11 – 3/22 : x = 21/11`

   `⇒ 3/22 : x = 27/11 – 21/11`

   `⇒ 3/22 : x = 6/11`

   `⇒ x = 3/22 : 6/11`

   `⇒ x = 3/22 . 11/6`

   `⇒ x = 1/4`

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