\(9:9+99\)

\(=1+99\)

\(=100\)

~ ^ _ ^ ~

\(\left|3-x\right|=4\)

\(\Rightarrow3-x=4hoặc-4\)

+) \(3-x=4\Rightarrow x=-1\)

+) \(3-x=-4\Rightarrow x=7\)

Vậy \(x\in\left\{-1;7\right\}\)

~ ^ _ ^ ~

Giải

\(2n+5⋮n+1\)

\(\Rightarrow n+n+5⋮n+1\)

\(\Rightarrow n+1+n+1+3⋮n+1\)

\(Vìn+1+n+1⋮n+1\)

\(\Rightarrow3⋮n+1\)

\(\Rightarrow n+1\inƯ\left(3\right)=\left\{1;3\right\}\)

\(n+1=1\Rightarrow n=0\)

\(n+1=3\Rightarrow n=2\)

~ ^ _ ^ ~

737737 . 255 - 255255 . 737

= 737 . 1001 . 255 - 255255 . 737

= 737 . 255255 - 255255 . 737

= 737 . (255255 - 255255)

= 737 . 0

= 0

Chúc bạn học tốt nha!