NHỜ CÁC CHUYÊN GIA GIẢI GIÚP EM BÀI NÀY VỚI Ạ 4/9 x [ 7/2 – 1 1/4 ] – 3/4 x X = 1/2

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1. $\dfrac{4}{9}\times (\dfrac{7}{2}-1\dfrac{1}{4})-\frac{3}{4}\times x = \dfrac{1}{2}$ 

   $\dfrac{4}{9}\times (\dfrac{7}{2}-\dfrac{5}{4}) -\dfrac{3}{4}\times x=\dfrac{1}{2}$

   $\dfrac{4}{9}\times (\dfrac{14}{4}-\dfrac{5}{4})-\dfrac{3}{4}\times x =\dfrac{1}{2}$

   $\dfrac{4}{9}\times \dfrac{9}{4}-\dfrac{3}{4}\times x =\dfrac{1}{2}$

   $1-\dfrac{3}{4}\times x =\dfrac{1}{2}$

   $\dfrac{3}{4}\times x = 1-\dfrac{1}{2}$

   $\dfrac{3}{4}\times x=\dfrac{1}{2}$

   $x=\dfrac{1}{2}:\dfrac{3}{4}$

   $x=\dfrac{2}{3}$

   Trả lời

2. `4/9 × ( 7/2 – 1 1/4 ) – 3/4 × x = 1/2`

   `4/9 × ( 7/2 – 5/4 ) – 3/4 × x = 1/2`

   `4/9 × ( 14/4 – 5/4 ) – 3/4 × x = 1/2`

   `4/9 × 9/4 – 3/4 × x = 1/2`

   `( 4/9 × 9/4 ) – 3/4 × x = 1/2`

   `1 – 3/4 × x = 1/2`

   `3/4 × x = 1/2`

   `x = 1/2 : 3/4`

   `x = 1/2 × 4/3`

   `x = 2/3`

   HỌC TỐT NHA !

   #Sâu

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