a) | x + 3/4| – 1/3 = 0 b) | x + 13/7| + | x + 2020/2021| + | x – 1| = 0

0 bình luận về “a) | x + 3/4| – 1/3 = 0 b) | x + 13/7| + | x + 2020/2021| + | x – 1| = 0”

1. a) | x + $\frac{3}{4}$ | – $\frac{1}{3}$ = 0

   | x + $\frac{3}{4}$ | = 0 + $\frac{1}{3}$

   | x + $\frac{3}{4}$ | =  $\frac{1}{3}$

    TH1 : 

   x + $\frac{3}{4}$ =  $\frac{1}{3}$ 

   x= $\frac{1}{3}$  – $\frac{3}{4}$

   x= $\frac{-5}{12}$

   TH2:

   x + $\frac{3}{4}$ = – $\frac{1}{3}$ 

   x= -$\frac{1}{3}$  – $\frac{3}{4}$

   x=- $\frac{13}{12}$  

   b) | x + 13/7| + | x + 2020/2021| + | x – 1| = 0

   x + 13/7 = 0 

   x= – 13/7

   x + 2020/2021 = 0 

   x= – 2020/2021

   x – 1 = 0

   x= 1 

   Bình luận

2. a) l x + 3/4 l -1/3 =0

   l x + 3/4 l = 0 + 1/3 

   x+ 3/4 = 1/3 hoặc x + 3/4 = -1/3

   x=1/3 – 3/4            x = -1/3 – 3/4

   x = 4/12 – 9/12       x= -4/12 – 9/12

   x = -5/12                 x = -13/12

                     vậy x = { -5/12 ; -13/12 }

    Chúc bạn học tốt nhé

   nếu  hay cho 5* nha

    

    

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