Tìm x, y a) x + 5/4 = ( 3/2 )^ 2 b) 3/4 + 2/5x = 19/20 c) (1/3x) : 2/3 = 1 1/3 : 2/5 d) 8: ( 1/4x ) = 2:0,02

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1. Giải thích các bước giải:

   $a)$ `x +5/4 = (3/2)²`

   `⇒ x = 9/4 -5/4`

   `⇒ x = 1`

   Vậy `x = 1`

   —————-

   $b)$ `3/4 +2/5x = 19/20`

   `⇒ 2/5x = 1/5`

   `⇒ x = 1/5 : 2/5`

   `⇒ x = 1/2`

   Vậy `x = 1/2`

   —————-

   $c)$ `(1/3x) : 2/3 = 1 3/4 : 2/5`

   `⇒ 1/3x = 35/8 . 2/3`

   `⇒ 1/3x = 35/12`

   `⇒ x = 35/4`

   Vậy `x = 35/4`

   —————-

   $d)$ `8: ( 1/4x ) = 2 : 0,02`

   `⇒ 1/4x = 8 :100`

   `⇒ 1/4x = 0,08`

   `⇒ x = 0,32`

   Vậy `x = 0,32`

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