Question

tim x \(\in\) Z

3x-17=x+3

Ix-3I-12=I-5I

25-(x-5)=-415-(15-415)

Answer 1

1) \(3x-17=x+3\)

\(3x-x=3+17\)

\(2x=20\)

\(x=10\)

Vậy x=10

2) \(\left|x-3\right|-12=\left|-5\right|\)

\(\left|x-3\right|-12=5\)

\(\left|x-3\right|=17\)

\(\Rightarrow x-3=17\) hoặc \(x-3=-17\)

\(\Rightarrow x=20\) hoặc \(x=-14\)

Vậy x= 20 hoặc x= -14

3) \(25-\left(x-5\right)=-415-\left(15-415\right)\)

\(25-\left(x-5\right)=-15\)

\(-\left(x-5\right)=-15-25\)

\(-\left(x-5\right)=-40\)

\(x-5=40\)

\(x=35\)

Vậy x=35