Answer 1

\(\left|a-13\right|-5+17=21-\left(-3\right)\)

\(\Rightarrow\left|a-13\right|+12=24\)

\(\Rightarrow\left|a-13\right|=12\)

\(\Rightarrow a-13=\pm12\)

+) \(a-13=12\Rightarrow a=25\)

+) \(a-13=-12\Rightarrow a=1\)

Vậy \(a\in\left\{25;1\right\}\)

 

 

Answer 2

\(\left|a-13\right|-5+17=21-\left(-3\right)\)

=> \(\left|a-13\right|+12=24\)

=> \(\left|a-13\right|=12\)

=> a - 13 = \(\pm\) 12

=> \(\left[\begin{array}{nghiempt}a-13=12\Rightarrow a=25\\a-13=-12\Rightarrow a=1\end{array}\right.\)

Vậy a = 25 hoặc a = 1

Answer 3

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