Bài 9: Tìm BC thông qua tìm BCNN
c) 20, 35, 60
d) 18, 24, 32
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,ƯC\left(40,24\right)=Ư\left(8\right)=\left\{...\right\}\\ b,ƯC\left(12,52\right)=Ư\left(4\right)=\left\{...\right\}\\ c,ƯC\left(36,990\right)=Ư\left(18\right)=\left\{...\right\}\\ d,ƯC\left(54,36\right)=Ư\left(9\right)=\left\{...\right\}\\ e,ƯC\left(10,20,70\right)=Ư\left(10\right)=\left\{...\right\}\\ f,ƯC\left(25,55,75\right)=Ư\left(5\right)=\left\{...\right\}\\ g,ƯC\left(80,144\right)=Ư\left(16\right)=\left\{...\right\}\\ h,ƯC\left(63,2970\right)=Ư\left(9\right)=\left\{...\right\}\\ i,ƯC\left(65,125\right)=Ư\left(5\right)=\left\{...\right\}\\ j,ƯC\left(9,18,72\right)=Ư\left(9\right)=\left\{...\right\}\\ k,ƯC\left(24,36,60\right)=Ư\left(12\right)=\left\{...\right\}\\ l,ƯC\left(16,42,86\right)=Ư\left(2\right)=\left\{..\right\}\)
a) 8 = 2³
10 = 2.5
20 = 2².5
BCNN(8; 10; 20) = 2³.5 = 40
b) 16 = 2⁴
24 = 2³.3
BCNN(16; 24) = 2⁴.3 = 48
c) 60 = 2².3.5
140 = 2².5.7
BCNN(60; 140) = 2².3.5.7 = 420
d) 8 = 2³
9 = 3²
11 = 11
BCNN(8; 9; 11) = 2³.3².11 = 792
e) 24 = 2³.3
40 = 2³.5
162 = 2.3⁴
BCNN(24; 40; 162) = 2³.3⁴.5 = 3240
f) 56 = 2³.7
70 = 2.5.7
126 = 2.3².7
BCNN(56; 70; 126) = 2³.3².5.7 = 2520
g) 28 = 2².7
20 = 2².5
30 = 2.3.5
BCNN(28; 20; 30) = 2².3.5.7 = 420
h) 34 = 2.17
32 = 2⁵
20 = 2².5
BCNN(34; 32; 20) = 2⁵.5.17 = 2720
k) 42 = 2.3.7
70 = 2.5.7
20 = 2².5
BCNN(42; 70; 20) = 2².3.5.7 = 420
l) 9 = 3²
10 = 2.5
11 = 11
BCNN(9; 10; 11) = 2.3².5.11 = 990
g) Ta có: 54 = 2 . 33
36 = 22.32
=>ƯCLN(54; 36) = 2.32 = 18
=> ƯC(54;36) = Ư(18) = {1; 2; 3; 6; 9; 18}
j) Ta có: 9 = 32
18 = 2.32
72 = 23 . 32
=> ƯCLN(9; 18; 72) = 32 = 9
=> ƯC(9; 18; 72) = Ư(9) = {1; 3; 9}
h) Ta có: 10 = 2.5
20 = 22 . 5
60 = 22 . 3.5
=> ƯCLN(10; 20; 60) = 2.5 = 10
=> ƯC(10; 20; 60) = Ư(10) = {1; 2; 5; 10}
g) Ta có : 54 = 2.33
36 = 22.32
=> ƯCLN ( 54; 36 ) = 2.32 = 18
=> ƯC ( 54;36 ) = Ư(18) = ( 1; 2; 3; 6; 9; 18 )
j) Ta có : 9 = 32
18 = 2.32
72 = 23.32
=> ƯCLN ( 9; 18; 72 ) = 32 = 9
h) Ta có : 10 = 2.5
20 = 22.5
60 = 22.3.5
=> ƯCLN ( 10; 20; 60 ) = 2.5 = 10
=> ƯC ( 10; 20; 60 ) = Ư ( 10 ) - { 1; 2; 5; 10 }
Ta có:8=23
10=2.5
24=24.5
BCNN(...)=23.5=24.5=40
b)Ta có:
16=24
24=23.3
BCNN(...)=24.3=48
c)Ta có:
60=22.3.5
140=22.5.7
BCNN(...)=22.3.5.7=420
Mấy bài sau bn cứ lm như thế này nhé^^
a) (15 +35) : 5 = ?
Cách 1: (15 +35) : 5
= 50 : 5 = 10
Cách 2: (15 +35) : 5
= 15 : 5 + 35 : 5
= 3 + 7 = 10
+) (80 +4) : 4 = ?
Cách 1:(80 +4) : 4
= 84 : 4 = 21
Cách 2:(80 +4) : 4
= 80 : 4 + 4 :4 = 20 +1 = 21
b) 18 : 6 + 24 : 6 = ?
Cách 1: 18 : 6 + 24 : 6
= 3 + 4 = 7
Cách 2: (18 + 24) : 6
= 42 : 6 = 7
+) 60 : 3 + 9 : 3 =?
Cách 1: 60 : 3 + 9 : 3
= 20 + 3 = 23
Cách 2: 60 : 3 + 9 : 3
=(60 +9) : 3 = 23
a) (15 +35) : 5 = ?
Cách 1: (15 +35) : 5
= 50 : 5 = 10
Cách 2: (15 +35) : 5
= 15 : 5 + 35 : 5
= 3 + 7 = 10
+) (80 +4) : 4 = ?
Cách 1:(80 +4) : 4
= 84 : 4 = 21
Cách 2:(80 +4) : 4
= 80 : 4 + 4 :4 = 20 +1 = 21
b) 18 : 6 + 24 : 6 = ?
Cách 1: 18 : 6 + 24 : 6
= 3 + 4 = 7
Cách 2: (18 + 24) : 6
= 42 : 6 = 7
+) 60 : 3 + 9 : 3 =?
Cách 1: 60 : 3 + 9 : 3
= 20 + 3 = 23
Cách 2: 60 : 3 + 9 : 3
=(60 +9) : 3 = 23
HTa 10=2.5
24=23.3
BCNN(10,24)=23.5.3=120
→BC(10,24)=B(120)={0;120;240;360;480;....}
b 20=22.5
35=7.5
60=22.3.5
BCNN(20,35,60)=22.3.5.7=420
→BC(20,35,60)=B(420)={0;420;840;1260;...}
c 48=24.3
120=23.3.5
BCNN(48,120)=24.3.5=240
→BC(48,120)=B(240)={0;240;480;720;...}
d
18=2.32
24=23.3
32=25
BCNN(18,24,32)=25.32=288
→BC(18,24,32)=B(288)={0;288;576;864;...}