Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Ta có: \(36=2^2\cdot3^2\)
\(90=2\cdot3^2\cdot5\)
Do đó: \(UCLN\left(36;90\right)=2\cdot3^2=18\)
Vậy: UCLN(36;90)=18
Ư(36) ={ 1; 36; 18; 2; 3; 12; 4; 9; 6 }
Ư(90) = { 1; 90; 3; 30; 2; 45; 18; 5; 15; 6; 9; 10 }
ƯC ={ 1; 2; 3; 6; 18; 9 }
ƯCLN : 18
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) ƯCLN ( 84, 126, 210 )
84 = 22 . 3 . 7
126 = 2 . 32 . 7
210 = 2 . 3 . 5 . 7
ƯCLN ( 84, 126, 210 ) = 2 . 3 . 7 = 42
➤ ƯCLN ( 84, 126, 210 ) = 42
b) BCNN ( 36, 45, 63 )
36 = 22 . 32
45 = 32 . 5
63 = 32 . 7
BCNN ( 36, 45, 63 ) = 22 . 32 . 5 . 7 = 1260
BCNN ( 36, 45, 63 ) = 1260
Ta có:
\(a=36=2^2\cdot3^2\)
\(b=60=3\cdot2^2\cdot5\)
\(c=90=3^2\cdot2\cdot5\)
\(\Rightarrow\text{Ư}CLN\left(a,b,c\right)=\text{Ư}CLN\left(36;60;90\right)=3\cdot2=6\)
\(\Rightarrow BCNN\left(a,b,c\right)=BCNN\left(36,60,90\right)=3^2\cdot5\cdot2^2=180\)
a, 36 = 2^2.3^2
60 = 2^2.3.5
ƯCLN(36;60) = 2^2.3=12
B,40= 2^3.5
60= 2^2.3.5
ƯCLN(40;60)= 2^2.5=20
c,30= 2.3.5
60=2^2.3.5
90=2.3^2.5
ƯCLN(30;60;90)= 2.3.5=30
KIK NHÁ TUI Làm nhanh nhất
a) Ta có :
36 = 22 . 32
60 = 22 . 3 .5
=> ƯCLN(36;60) = 22 . 3 = 12
b) Ta có :
40 = 23 . 5
60 = 22 . 3 . 5
=> ƯCLN(40;600 = 22 . 5 = 20
c) Ta có :
30 = 3 . 2 . 5
60 = 22 . 3 . 5
90 = 33 . 2 . 5
=> ƯCLN(30;60;90) = 2 . 3 . 5 = 30
C2
Vì 60 chia hết cho 30 ; 90 chia hết cho 30 nên 30 là ƯCLN của 30 ; 60 ; 90
Vậy ƯCLN(30;60;90) = 30
a) ƯCLN ( 16, 24 )
16 = 23 24 = 22.3
ƯCLN ( 16;24 ) = 22= 4
b) ƯCLN ( 60, 90 )
60 = 22.3.5 90=2.32.5
ƯCLN ( 60;90 ) = 2.3.5 = 30
c) ƯCLN ( 24, 84 )
24 = 23.3 84 = 22.3.7
ƯCLN ( 24;84 ) = 22.3 = 12
d) ƯCLN ( 16, 60 )
16 = 24 60 = 22.3.5
ƯCLN ( 16;60 ) = 22=4
e) ƯCLN ( 18, 77 )
18 = 2.32 77=7.11
ƯCLN ( 18; 77 ) = 1
g) ƯCLN ( 18, 90 )
18 = 2.32 90=2.32.5
ƯCLN ( 18;90 ) = 2.32 = 18
h) ƯCLN ( 18, 30, 42 )
18 = 2.32 30 = 2.3.5 42 = 2.3.7
ƯCLN ( 18;30;42 ) = 2.3=6
k) ƯCLN ( 26, 39, 48 )
26 = 2.13 39 = 3.13 48 = 24.3
ƯCLN ( 26;39;48 ) = 1
\(90=2.3^2.5\\ 63=3^2.7\\ 36=2^2.3^2\)
\(=>UCLN\left(90;63;36\right)=3^2=9\)