Question

Tìm  x\(\in\)Z , biết:

a) \(x^2-3x-5⋮x-3\)

b) \(2x-2+3x+2⋮x+1\)

c) \(\left|5-2x\right|=17\)với \(x\le6\)

huhu ai giúp cho 3 like ko nói nhiều

cảm ơn các bn giúp mk cảm ơn & hậu tạ

thanks

Answer 1

Giúp mk với  k cho 3

Answer 2

a)\(x^2-3x-5⋮x-3\)

\(x\left(x-3\right)-5⋮x-3\)

\(\Rightarrow5⋮x-3\)

\(\Rightarrow x-3\in\left\{.........\right\}\)

\(\Rightarrow x\in\left\{........\right\}\)

b)\(2x-2+3x+2⋮x=1\)

\(2\left(x+1\right)-4+3\left(x+1\right)-1⋮x+1\)

\(5\left(x+1\right)-5⋮x=1\)

\(\Rightarrow5⋮x+1\)

c)\(\left|5-2x\right|=17\)\(\Rightarrow\orbr{\begin{cases}5-2x=17\\5-2x=-17\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}2x=-12\\2x=22\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x=-6\\x=11\end{cases}}\)

Mà \(x\le6\Rightarrow x=-6\)