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36 = 2².3²
54 = 2.3³
ƯCLN(36; 54) = 2.3² = 18
BCNN(36; 54) = 2².3³ = 108
--------
40 = 2³.5
72 = 2³.3²
90 = 2.3².5
ƯCLN(40; 72; 90) = 2
BCNN(40; 72; 90) = 2³.3².5 = 360
a) Tìm UCLN (56, 84, 140)
56 = 23 . 7
84 = 22 . 3 . 7
140 = 22 . 5 . 7
UCLN (56, 84, 140) = 22 . 7 = 28
➤ UCLN (56, 84, 140) = 28
b) BCNN (72, 90, 108)
72 = 23 . 32
90 = 2 . 32 . 5
108 = 22 . 33
BCNN (72, 90, 108) = 23 . 33 . 5 = 1080
➤ BCNN (72, 90, 108) = 1080
a, 56 = 23 . 7 ; 84 = 22 . 3 . 7 ; 140 = 22 . 5 .7
ƯCLN ( 56, 84, 140) : 22 . 7 = 28
b 72 = 23 . 32; 90 = 2 . 32 . 5 ; 108 = 22 . 33
BCNN ( 72, 90, 108 ) : 23 . 33 . 5 = 1080
40=2.2.2.5
52=2.2.13
BCNN=2.2.2.5.13=520
b,30=2.3.5
90=2.3.3.5
BCNN=2.3.3.5=90
a: UCLN(90;30)=30
BCNN(90;30)=90
b: UCLN(140;210;56)=14
BCNN(140;210;56)=840
c: UCLN(105;84;30)=3
BCNN(105;84;30)=420
a) ƯCLN(30,40,50) = 10
BCNN(30,40,50) = 600
b) ƯCLN(30,45,75) = 15
BCNN(30,45,75) = 450
c) ƯCLN(72,45,52) = 1
BCNN(72,45,52) = 4680
d) ƯCLN(26,39,52) = 13
BCNN(26,39,52) = 156
Chúc bạn học tốt.
a)ta có:
30=2.3.5
40=23.5
50=2.52
=>UCLN(30;40;50)=2.5=10
=> BCNN(30;40;50)=23.3.52=600
b)ta có:
30=2.3.5
45=32.5
75=3.52
=>ƯCLN(30;45;75)=3.5=15
=>BCNN(30;45;75)=2.32.52=450
c)ta có:
72=23.32
45=32.5
52=22.13
=>ƯCLN(72;45;52)=1
=>BCNN(72;45;52)=23.32.5.13=4680
d)ta có:
26=2.13
39=3.13
52=22.13
=>ƯCLN(26;39;52)=13
=>BCNN(26;39;52)=22.3.13=156
BCNN(30,90,72)= 720 nha bn
Tl
=720 nhe bn
Hok tốt nha
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