|1/2x +1,25| – 1 2/3=-1/2 5/3 +-7/12+(-1/2)^2

1 bình luận về “|1/2x +1,25| – 1 2/3=-1/2 5/3 +-7/12+(-1/2)^2”

1. |1/2x+1,25|- 1 2/3=-1/2

   <=>|1/2x+1,25|-5/3=-1/2

   <=>|1/2x+1,25|=-1/2+5/3

   <=>|1/2x+1,25|=7/6

   <=> \(\left[ \begin{array}{l}\frac{1}{2}x+1,25=\frac{7}{6}\\\frac{1}{2}x+1,25=\frac{-7}{6}\end{array} \right.\) 

   <=> \(\left[ \begin{array}{l}\frac{1}{2}x=\frac{7}{6}-1,25\\\frac{1}{2}x=\frac{-7}{6}-1,25\end{array} \right.\) 

   <=> \(\left[ \begin{array}{l}\frac{1}{2}x=\frac{-1}{12}\\\frac{1}{2}x=\frac{-29}{12}\end{array} \right.\) 

   <=> \(\left[ \begin{array}{l}x=\frac{-1}{12}:\frac{1}{2}\\x=\frac{-29}{12}:\frac{1}{2}\end{array} \right.\) 

   <=> \(\left[ \begin{array}{l}x=\frac{-1}{6}\\x=\frac{-29}{6}\end{array} \right.\) 

   Vậy x in {-29/6;-1/6}

                                                                                   

   5/3+(-7/12)+(-1/2)^2

   =5/3+(-7/12)+1/4

   ={20+(-7)+3}/12

   =16/12=4/3

   $\color{pink}{tryy}$

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