Bài 1: Tìm x biết. a) 2 – (x+ 3/7) = 9/-21. b) (x + 1)² = 2/3 – 8/3. ——— 2

16/10/2023

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1. Bài 1:

   a)2-(x+3/7)=9/-21

   =>x+3/7=2 – -9/21

   =>x+3/7=17/7

   =>x=17/7-3/7

   =>x=2

   Vậy x=2

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   b)(x+1)^2/2 =2/3-8/3

   =>(x+1)^2/2 =-2

   =>(x+1)^2/2 =-4/2

   =>(x+1)^2=-4(vô lí )

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   c)(7/2+2xx x)xx8/3=16/3

   =>7/2+ 2 xx x=16/3 :8/3

   =>7/2 + 2 xx x=2

   =>2xx x=2-7/2

   =>2 xx x=-3/2

   =>x=-3/2:2

   =>x=-3/4

   Vậy x=-3/4

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