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, 40=23.5
60=22.3.5
ƯCLN(40;60)=22.5=20
b, 36=22.32
60=22.3.5
72=23.32
ƯCLN(36;60;72)=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
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