Question

Answer 1

Bài 1:
Ta có:

$8=2^3$

$20=2^2.5$

$\Rightarrow ƯCLN(8,20)=2^2=4$

 

Answer 2

Bài 2:
a.

$45=3^2.5$

$117=3^2.113$

$\Rightarrow ƯCLN(45,117)=3^2=9$

c. 

$24=2^3.3$

$36=2^2.3^2$

$60=2^2.3.5$

$\Rightarrow ƯCLN(24,36,60)=2^2.3=12$

b.

$390=2.3.5.13$

$208=2^4.13$

$\Rightarrow ƯCLN(390,208)=2.13=26$

d.

$16=2^4$

$64=2^6$

$400=2^4.5^2$

$\Rightarrow ƯCLN(16,64,400)=2^4=16$