bài 1: tìm x a,2x X+2/5 =8/3 b, 4 x X : 3/4 =6/5 c,7/8:3 x X =12/35

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1. a, 2 . x + $\frac{2}{5}$ = $\frac{8}{3}$ 

      2x = $\frac{8}{3}$ – $\frac{2}{5}$

      2x = $\frac{34}{15}$

        x = $\frac{17}{15}$

   b, 4 . x : $\frac{3}{4}$ = $\frac{6}{5}$ 

       4 . x = $\frac{6}{5}$  . $\frac{3}{4}$

       4 . x = $\frac{9}{10}$

           x = $\frac{9}{40}$  

   c, $\frac{7}{8}$ : 3 . x = $\frac{12}{35}$ 

       $\frac{7}{24}$ . x = $\frac{12}{35}$ 

       x = $\frac{12}{35}$ : $\frac{7}{24}$ 

       x = $\frac{288}{245}$ 

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2. `a) 2 × x + 2/5 = 8/3`

   `2 × x = 8/3 – 2/5`

   `2 × x = 34/15`

   `x = 34/15 : 2`

   `x = 17/15 .`

   `b) 4 × x : 3/4 = 6/5`

   `4 × x = 6/5 × 3/4`

   `4 × x = 9/10`

   `x = 9/10 : 4`

   `x = 9/40 .`

   `c) 7/8 : 3 × x = 12/35`

   `3 × x = 7/8 : 12/35`

   `3 × x = 245/96`

   `x = 245/96 : 3`

   `x = 245/288 .`

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