Bài 1:
a) 12 = 22 . 3
18 = 2 . 32
UCLN(12,18) = 2 . 3 = 6
BCNN(12,18) = 22 . 32 = 4 . 9 = 36
b) 12 = 22 . 3
10 = 2 . 5
UCLN(12,10) = 2
BCNN(12,10) = 22 . 3 . 5 = 4 . 3 .5 = 60
c) vì 48 \(⋮\) 24 => UCLN(48,24) = 24, BCNN(48,12) = 48
d) 300 = 22 . 3 . 52
280 = 23 . 7 . 5
UCLN(300,280) = 23 . 5 = 8 . 5 = 40
BCNN(300,280) = 23 . 3 . 7 . 52 = 4200
Bài 2
a) 40 = 23 . 5
24 = 23 . 3
UCLN(40,24) = 23 = 8
b) 12 = 22 . 3
52 = 22 . 13
UCLN(12,52) = 22 = 4
c) 36 = 22 . 32
990 = 2 . 3 . 5 . 11
UCLN(36,990) = 2 . 3 = 6
Bài 3:
a) 24 = 23 . 3
10 = 2 . 5
BCNN(24,10) = 23 . 3 . 5 = 120
b) 9 = 32
24 = 23 . 3
BCNN(9,24) = 23 . 32 = 8 . 9 = 72
c) 12 = 22 . 3
52 = 22 . 13
BCNN(12,52) = 22 . 3 . 13 = 156
d) 18 = 2 . 32
24 = 23 . 3
30 = 2 . 3 . 5
BCNN(18,24,30) = 23 . 32 . 5 = 8 . 9 . 5 = 360
Bài 1:
1: ƯCLN(12;18)=6
BCNN(12;18)=36
2: ƯCLN(12;10)=2
BCNN(12;10)=60
3: ƯCLN(24;48)=24
BCNN(24;48)=48
4: ƯCLN(300;280)=20
BCNN(300;280)=8400
Bài 1:
1: ƯCLN(12;18)=6
BCNN(12;18)=36
2: ƯCLN(12;10)=2
BCNN(12;10)=60
3: ƯCLN(24;48)=24
BCNN(24;48)=48
4: ƯCLN(300;280)=20
BCNN(300;280)=8400
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