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a) ƯCLN ( 16, 24 )
16 = 23 24 = 22.3
ƯCLN ( 16;24 ) = 22= 4
b) ƯCLN ( 60, 90 )
60 = 22.3.5 90=2.32.5
ƯCLN ( 60;90 ) = 2.3.5 = 30
c) ƯCLN ( 24, 84 )
24 = 23.3 84 = 22.3.7
ƯCLN ( 24;84 ) = 22.3 = 12
d) ƯCLN ( 16, 60 )
16 = 24 60 = 22.3.5
ƯCLN ( 16;60 ) = 22=4
e) ƯCLN ( 18, 77 )
18 = 2.32 77=7.11
ƯCLN ( 18; 77 ) = 1
g) ƯCLN ( 18, 90 )
18 = 2.32 90=2.32.5
ƯCLN ( 18;90 ) = 2.32 = 18
h) ƯCLN ( 18, 30, 42 )
18 = 2.32 30 = 2.3.5 42 = 2.3.7
ƯCLN ( 18;30;42 ) = 2.3=6
k) ƯCLN ( 26, 39, 48 )
26 = 2.13 39 = 3.13 48 = 24.3
ƯCLN ( 26;39;48 ) = 1
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a)ƯCLN(8, 9) = 8 = 1
b)ƯCLN(60, 180) = 60
c)ƯCLN(30, 45) = 5
d)ƯCLN(120,144) = 24
bài 2 :
a)24,84,180. là : 12
b)16,80,176. là : 16
c)8, 12, 15. là : 1
d) 24, 16, 8 là : 8
bài 3 : phân số nào mà rút
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a: UCLN(24;108)=12
b: UCLN(60;72)=12
c: UCLN(96;192)=96
d: UCLN(24;36;160)=4
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\(a,24=2^3\cdot3;108=2^2\cdot3^3\\ \RightarrowƯCLN\left(24,108\right)=2^2\cdot3=12\\ b,60=2^2\cdot3\cdot5;72=2^3\cdot3^2\\ \RightarrowƯCLN\left(60,72\right)=2^2\cdot3=12\\ c,96=2^5\cdot3;192=2^6\cdot3\\ \RightarrowƯCLN\left(96,192\right)=2^5\cdot3=96\\ d,24=2^3\cdot3;36=2^2\cdot3^2;160=2^5\cdot5\\ \RightarrowƯCLN\left(24,36,160\right)=2^2=4\)
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
D.24
A