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a) 40=23.5
60=22.3.5; ƯCLN(40,60)=22.5=20
b)36=22.32
60=22.3.5; ƯCLN(36,60)=22.3=12
c)13=13
20=22.5; ƯCLN(13,20)=1
d)28=22.7
39=3.13
35=5.7; ƯCLN(28,39,35)=1
a) 40=23.5
60=22.3.5; ƯCLN(40,60)=22.5=20
b)36=22.32
60=22.3.5; ƯCLN(36,60)=22.3=12
c)13=13
20=22.5; ƯCLN(13,20)=1
d)28=22.7
a) 28 = 2 2 . 7 ; 70 = 2.5.7 .Vậy ƯCLN(28,70) = 2.7 = 14
b) ƯCLN(36, 60,72) =12
c) ƯCLN(60,180) = 60
d) ƯCLN(28, 39, 35) = 1
a) 40 = 2³.5
60 = 2².3.5
ƯCLN(40; 60) = 2².5 = 20
ƯC(40; 60) = Ư(20) = {1; 2 ; 4; 5; 10; 20}
b) 28 = 2².7
39 = 3.13
35 = 5.7
ƯCLN(28; 39; 35) = 1
ƯC(28; 39; 35) = Ư(1) = 1
c) 48 = 2⁴.3
60 = 2².3.5
120 = 2³.3.5
ƯCLN(48; 60; 120) = 2².3 = 12
ƯC(48; 60; 120) = Ư(12) = {1; 2; 3; 4; 6; 12}
d) 30 = 2.3.5
75 = 3.5²
135 = 3³.5
ƯCLN(30; 75; 135) = 3.5 = 15
ƯC(30; 75; 135) = Ư(15) = {1; 3; 5; 15}
a) UCLN(40, 60)
Ta có: 40 = 23.5
60 = 22.3.5
UCLN(40, 60) = 22.5 = 20
b) UCLN(13, 20)
Ta có: 13 = 13
20 = 22.5
UCLN(13, 20) = 1
c) UCLN(36, 60, 72)
Ta có: 36 = 22.32
60 = 22.3.5
72 = 23.32
UCLN(36, 60, 70) = 22.3 = 12
d) UCLN(28, 39, 35)
Ta có: 28 = 22.7
39 = 39
35 = 5.7
UCLN(28, 39, 35) = 1
a) ƯCLN(40; 60)=20
b) ƯCLN(36; 60; 72)=12
c) ƯCLN(13;20)=1
d) ƯCLN(28; 39; 35;)=1
a: UCLN(24;36)=12
BCNN(24;36)=216
b: BCNN(24;36;60)=360
UCLN(24;36;60)=12
a:UCLN(12;18)=6
BCNN(12;18)=36
b: UCLN(24;36;60)=12
BCNN(24;36;60)=360
a, Ta có: \(40=2^3.5\\ 60=2^2.3.5\\ =>ƯCLN\left(40;60\right)=2^2.5=20\)
b, \(36=2^2.3^2\\ 60=2^2.3.5\\ 72=2^3.3^2\\ =>ƯCLN\left(36;60;72\right)=2^2.3=12\)
c, \(13=13.1\\ 20=2^2.5\\ =>ƯCLN\left(13;20\right)=1\)
d, \(28=2^2.7\\ 39=39.1\\ 35=7.5\\ =>ƯCLN\left(28;39;35\right)=1\)