Question

tim x thuoc Z biet 

a)4n-5 chia het cho n 

b)-11 la boi cua n-1

c)2n-1 la uoc cua 3n +2

Answer 1

Tìm số nguyên x,y biết

(x+1)*(y+1)=-13
 

Answer 2

\(\left(4n-5\right)⋮n\)

\(\Rightarrow5⋮n\)

\(\Rightarrow n\inƯ\left(5\right)=\left\{-5;-1;1;5\right\}\)

\(\Rightarrow n\in\left\{\pm5;\pm1\right\}\)

Answer 3

\(-11\text{ là bội của }n-1\)

\(\Rightarrow n-1\inƯ\left(-11\right)=\left\{\pm1;\pm11\right\}\)

\(\Rightarrow n\in\left\{2;0';12;-10\right\}\)

Answer 4

\(\left(4n-5\right)⋮n\)

\(\Rightarrow5⋮n\)

\(\Rightarrow n\inƯ\left(5\right)=\left\{-5;-1;1;5\right\}\)

\(\Rightarrow n\in\left\{\pm5;\pm1\right\}\)