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a, ƯCLN(40;60)=20
b, ƯCLN(36,60,72)=12
c, ƯCLN(13,20)=1
d, ƯCLN(28,39,35)=1
Chúc bạn học giỏi nha!!!
K cho mik với nhé nguyễn thị quyên
a)40=23x5
60=22x3x5
=>ƯCLN(40,60)=22x5=20
b)36=23xx3
60=22x3x5
72=24x3
=>ƯCLN =22X3=12
c)13=13
20=22x5
=>ƯCLN(13,20)=13x20=260
d)28=22x7
39=3x13
35=5x7
=>ƯCLN(28,39,35)=28X39X35=1393 nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a)ƯC(40,60)=Ư(20)={1,2,4,5,10,20}.
b)ƯC(36,60,72)=Ư(12)={1,2,3,4,6,12}.
c)ƯC(13,20)=1.
d)ƯC(28,39,35)=1
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a/ ta có : 40 = 23.5 b/ ta có : 36 = 22 . 32
60 = 22.3.5 60 = 22 . 3 . 5
=> ƯCLN (40,60) = 22 . 5 = 20 72 = 23 . 32
=> ƯCLN (36,60,72) = 22 . 3 = 12
c/ Ta có : 13 = 13 d/ ta có : 28 = 22 . 7
30 = 2. 3 . 5 39 = 3 . 13
=> ƯCLN (13,30) = 1 35 = 5 . 7
=> ƯCLN (28,39,35) = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
a: BCNN(60;280)=840
b: BCNN(84;108)=756
c: BCNN(5;8;15)=120
d: BCNN(12;16;48)=48
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,24=2^3\cdot3; 10=2\cdot5\\ ƯCLN\left(10,24\right)=2\\ BCNN\left(10,24\right)=2^3\cdot3\cdot5=120\\ b,9=3^2; 24=2^3\cdot3\\ ƯCLN\left(9,24\right)=3\\ BCNN\left(9,24\right)=2^3\cdot3^2=72\\ c,12=2^2\cdot3; 52=2^2\cdot13\\ ƯCLN\left(12,52\right)=2^2=4\\ BCNN\left(12,52\right)=2^2\cdot3\cdot13=156\\ d,14=2\cdot7;21=3\cdot7;56=2^3\cdot7\\ ƯCLN\left(14,21,56\right)=7\\ BCNN\left(14,21,56\right)=2^3\cdot3\cdot7=168\\ e,8=2^3;12=2^2\cdot3;15=3\cdot5\\ ƯCLN\left(8,12,15\right)=1\\ BCNN\left(8,12,15\right)=2^3\cdot3\cdot5=120\\ f,6=2\cdot3;8=2^3;10=2\cdot5\\ ƯCLN\left(6,8,10\right)=2\\ BCNN\left(6,8,10\right)=2^3\cdot3\cdot5=120\)
![](https://rs.olm.vn/images/avt/0.png?1311)
b: 100g=1/10kg
Tỉ số là 1/10:4/5=1/10*5/4=5/40=1/8
c: 7,5hm=750m
Tỉ số là 60/750=2/25
d: 60cm=3/5m
Tỉ số là: 4/3:3/5=4/3*5/3=20/9
a) 20
b) 1
c) 12
d)1
a )20
b)1
c)12
d)1