TÌM X BIẾT A, X:3/5+4/3=5/6 B, X:(3/5+4/3)=5/6 C,(X+3/5):4/3=5/6 D, X.1212/1515-X.1919/2020=6/-5

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1. a) `x÷3/5+4/3=5/6`

   `⇒ x÷3/5=5/6-4/3`

   `⇒ x÷3/5=-1/2`

   `⇒ x=(-1/2).3/5=-3/10`

   b) `x÷(3/5+4/3)=5/6`

   `⇒ x÷29/15=5/6`

   `⇒ x=(5/6).29/15=29/18`

   c) `(x+3/5)÷4/3=5/6`

   `⇒ x+4/3=(5/6).4/3`

   `⇒ x+4/3=10/9`

   `⇒ x=10/9-4/3=-2/9`

   d) `x.(1212/1515)-x.(1919/2020)=6/-5`

   `⇒ x.(4/5)-x.(19/20)=-6/5`

   `⇒ x(4/5-19/20)=-6/5`

   `⇒ x.(-3/20)=-6/5`

   `⇒ x=(-6/5)÷(-3/20)=8`

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2. A, X:3/5+4/3=5/6

   ⇔ X:3/5        = -1/2

   ⇔ X               = -3/10

   ________________________

   B, X:(3/5+4/3)=5/6

   ⇔ X:29/15      = 5/6

   ⇔ X                  = 29/18

   ___________________________
   C,(X+3/5):4/3=5/6

   ⇔X+3/5         = 10/9

   ⇔ X               = 23/45

   _______________________-
   D, X.1212/1515-X.1919/2020=6/-5

   ⇔ -3/20X                               = -6/5

   ⇔ X                                         = 8

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