1/4 + x = 5/2 x 8/7 ; 7/3 – x

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1. Đáp án:

   1/4 + x = 5/2 x 8/7

   1/4 + x = 20/7

             x = 20/7 – 1/4

             x= 87/28

   7/3 – x = 11/5 : 5/6

   7/3 – x = 66/25

            x = 66/25- 7/3

            x =  23/75

   23/6 : x – 2/5 = 1/4

   23/6 : x          = 1/4 + 2/5

   23/6 : x          = 13/20

             x          = 23/6 : 13/20

             x          = 230/39

   sr bạn vì Cam có việc bận nên trả lời lâu ^^”

   # The best of team

   ( mong bạn vẫn cho Cam ctlhn nhoa :3 ) học tốt nhé 

   thanks

    

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2. a) $\dfrac{1}{4}+x=\dfrac{5}{2}×\dfrac{8}{7}$

   $⇔ x=\dfrac{20}{7}-\dfrac{1}{4}=\dfrac{73}{28}$

   b) $\dfrac{7}{3}-x=\dfrac{11}{5}:\dfrac{5}{6}$

   $⇔ x=\dfrac{7}{3}-\dfrac{66}{25}=-\dfrac{23}{75}$

   c) $x+\dfrac{5}{2}×\dfrac{2}{3}=\dfrac{5}{2}$

   $⇔ x=\dfrac{5}{2}-\dfrac{5}{3}=\dfrac{5}{6}$

   d) $\dfrac{23}{6}:x-\dfrac{2}{5}=\dfrac{1}{4}$

   $⇔ \dfrac{23}{6}:x=\dfrac{13}{20}$

   $⇔ x=\dfrac{23}{6}:\dfrac{13}{20}=\dfrac{230}{39}$

    

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