X + 1/3 = 3/4 X – 2/5 = 5/7 -X – 2/3 = -6/7 4/7 – X = 1/3

0 bình luận về “X + 1/3 = 3/4 X – 2/5 = 5/7 -X – 2/3 = -6/7 4/7 – X = 1/3”

1. 1. X + 1/3 = 3/4

   X=3/4 -1/3=9/12-4/12

   X=5/12

   2. X – 2/5 = 5/7

   X= 5/7 + 2/5 = 25/35 + 14/35

   X= 39/35

   3. -X – 2/3 = -6/7

   -X= -6/7 + 2/3

   -X= -18/21 + 14/21

   -X= -4/21

   X= 4/21

   4. 4/7 – X = 1/3

   -X=1/3-4/7

   -X=7/21 – 12/21

   -X=-5/21

   X=5/21

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2. $\text { Đáp án: }$

   ` x + 1/3 = 3/4 `

   ` => x = 3/4 – 1/3 `

   ` => x = 9/12 – 4/12 `

   ` => x = 5/12 `

   ` x – 2/5 = 5/7 `

   ` => x = 5/7 + 2/5 `

   ` => x = 25/35 + 14/35 `

   ` => x = 39/35 `

   ` -x – 2/3 = -6/7 `

   ` => -x = -6/7 + 2/3 `

   ` => -x = -18/21 + 14/21 `

   ` => -x = -4/21 `

   ` => x = 4/21 `

   ` 4/7 – x = 1/3 `

   ` => x = 4/7 – 1/3 `

   ` => x = 12/21 – 7/21 `

   ` => x = 5/21 `

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