Question

Hãy viết tất cả các ước của \(a,b,c\) biết rằng :

a) \(a=7.11\)

b) \(b=2^4\)

c) \(c=3^2.5\)

Answer 1

a, Ư \(\left(a\right)=\left\{1;7;11;77\right\}\)

b, Ư \(\left(b\right)=\left\{1;2;4;8;16\right\}\)

c, Ư \(\left(c\right)=\left\{1;3;5;9;15;45\right\}\)

Answer 2

a) \(a=7\cdot11\Leftrightarrow a=77\)

\(\RightarrowƯ\left(a\right)=Ư\left(77\right)\)

\(Ư\left(a\right)=\left\{1;7;11;77\right\}\)

b) \(b=2^4\Leftrightarrow b=16\)

\(\RightarrowƯ\left(a\right)=Ư\left(16\right)=\left\{1;2;4;8;16\right\}\)

c) \(c=3^2\cdot5\Leftrightarrow c=45\)

\(\RightarrowƯ\left(c\right)=Ư\left(45\right)=\left\{1;3;5;9;15;45\right\}\)