BCNN(18;90)=90

BCNN(30;234)=1170

BCNN(134;60)=4020

BCNN(18,90) = 90
BCNN(30,234) = 1170
BCNN(134,60) = 4020

3276

3276

a) 30=2.3.5

135=3².5

=>UTLN(30,135)=3.5=15

b)30=2.3.5

234=2.3².13

=>UTLN(30,234)=2.3=6

c)134=2.67

60=2².3.5

=>UTLN(134,60)=2

d)176=2².4.11

234=2.3².13

=>UTLN(176,234)=2

e)180=2².3².5

176=2⁴.11

=>UTLN(180,176)=2²=4

Đổi hộ UTLN->UCLN nhá

a: UCLN=30

BCNN=360

b: UCLN=12

BCNN=720

Câu a:

90 = 2.3^2.5; 120 = 2^3.5.3

BCNN(90; 120) = 2^3.3^2.5 = 360

ƯCLN(90 ; 120) = 2.3.5 = 30

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) 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

a: B(6)={6;12;18;24;...}

B(9)={9;18;27;...}

B(12)={12;24;36;...}

Ư(30)={1;-1;2;-2;3;-3;5;-5;6;-6;10;-10;15;-15;30;-30}

Ư(45)={1;-1;3;-3;5;-5;9;-9;15;-15;45;-45}

Ư(60)={1;-1;2;-2;3;-3;4;-4;5;-5;6;-6;10;-10;12;-12;15;-15;20;-20;30;-30;60;-60}

b: \(36=2^2\cdot3^2;48=2^4\cdot3\)

=>ƯCLN(36;48)=\(2^2\cdot3=12\)

\(24=2^3\cdot3;28=2^2\cdot7;36=2^2\cdot3^2\)

=>ƯCLN(24;28;36)=\(2^2=4\)

c: \(6=3\cdot2;8=2^3\)

=>BCNN(6;8)=\(2^3\cdot3=8\cdot3=24\)

\(8=2^3;9=3^2;72=2^3\cdot3^2\)

=>BCNN(8;9;72)=\(2^3\cdot3^2=72\)

d: \(15=3\cdot5;54=3^3\cdot2\)

=>BCNN(15;54)=\(3^3\cdot2\cdot5=27\cdot10=270\)

=>BC(15;54)={270;540;810;1080;...}

=>Các bội chung nhỏ hơn 1000 của 15 và 54 là 270;540;810

\(60=2^2\cdot3\cdot5\)

\(80=2^4\cdot5\)

\(100=2^2\cdot5^2\)

\(ƯCLN\left(60;80;100\right)=2^2\cdot5=20\)

\(BCNN\left(60;80;100\right)=2^4\cdot3\cdot5^2=16\cdot3\cdot25=400\cdot3=1200\)

\(60=2^2.3.5\)

\(80=2^4.5\)

\(100=2^2.5^2\)

\(ƯCLN=2^2.5=20\)

\(BCNN=2^4.3.5^2=1200\)

ta có :

132=2².3.11

234=.3².13

=>BCNN(132;234)=2².3².11.13=5148

=>UCLN(132;234)=2.3=6

Ta có: 132 = 2².3.11

234 = 2.3².13

=> BCNN(132;234) = 2².3².11.13 = 5148

Vậy BCNN(132;234) = 5148