60/36=15/9

Chọn B

B

B

a,15

b,1

A, 15
B, 1

a) 15

b) 1

a: UCLN(24;108)=12

b: UCLN(60;72)=12

c: UCLN(96;192)=96

d: UCLN(24;36;160)=4

\(a,24=2^3\cdot3;108=2^2\cdot3^3\\ \RightarrowƯCLN\left(24,108\right)=2^2\cdot3=12\\ b,60=2^2\cdot3\cdot5;72=2^3\cdot3^2\\ \RightarrowƯCLN\left(60,72\right)=2^2\cdot3=12\\ c,96=2^5\cdot3;192=2^6\cdot3\\ \RightarrowƯCLN\left(96,192\right)=2^5\cdot3=96\\ d,24=2^3\cdot3;36=2^2\cdot3^2;160=2^5\cdot5\\ \RightarrowƯCLN\left(24,36,160\right)=2^2=4\)

a,24=23⋅3;108=22⋅33⇒ƯCLN(24,108)=22⋅3=12b,60=22⋅3⋅5;72=23⋅32⇒ƯCLN(60,72)=22⋅3=12c,96=25⋅3;192=26⋅3⇒ƯCLN(96,192)=25⋅3=96d,24=23⋅3;36=22⋅32;160=25⋅5⇒ƯCLN(24,36,160)=22=4

Ta có:

\(a=36=2^2\cdot3^2\)

\(b=60=3\cdot2^2\cdot5\)

\(c=90=3^2\cdot2\cdot5\)

\(\Rightarrow\text{Ư}CLN\left(a,b,c\right)=\text{Ư}CLN\left(36;60;90\right)=3\cdot2=6\)

\(\Rightarrow BCNN\left(a,b,c\right)=BCNN\left(36,60,90\right)=3^2\cdot5\cdot2^2=180\)

a, 36 = 2^2.3^2

60 = 2^2.3.5

ƯCLN(36;60) = 2^2.3=12

B,40= 2^3.5

60= 2^2.3.5

ƯCLN(40;60)= 2^2.5=20

c,30= 2.3.5

60=2^2.3.5

90=2.3^2.5

ƯCLN(30;60;90)= 2.3.5=30

KIK NHÁ TUI Làm nhanh nhất

a) Ta có :

36 = 2² . 3²

60 = 2² . 3 .5 

=> ƯCLN(36;60) = 2² . 3 = 12

b) Ta có :

40 = 2³ . 5

60 = 2² . 3 . 5

=> ƯCLN(40;600 = 2² . 5 = 20

c) Ta có :

30 = 3 . 2 . 5

60 = 2² . 3 . 5

90 = 3³ . 2 . 5

 => ƯCLN(30;60;90) = 2 . 3 . 5 = 30 

C₂

Vì 60 chia hết cho 30 ; 90 chia hết cho 30 nên 30 là ƯCLN của 30 ; 60 ; 90

Vậy ƯCLN(30;60;90) = 30

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