Question

Tìm bội chung nhỏ nhất

A,10;12;15

B,150;25;175

C,56;40;120

D,84;108

E,45;204;126

Giúp mik ik ,mik đag cần gấp á

 

Answer 1

A. 10; 12; 15

10 = 2.5

12 = 2².3

15 = 3.5

BCNN(10; 12; 15) = 2².3.5 = 60

Answer 2

B, 150; 25; 175;

150 =2.3.5²

25 = 5²

175 = 5².7

BCNN(150; 25; 175) = 2.3.5².7 = 1050

Answer 3

C, 56 = 2³.7

    40 = 2³.5

  120 = 2³.3.5

BCNN(56; 40; 120) = 2³.5.7 = 840

 

Answer 4

D, 84 = 2².3.7

     108 = 2².3³

BCNN(108; 84) = 2².3³.7 = 756

Answer 5

C)

56 = 2³.7

40 = 2³.5

120 = 2³.3.5

BCNN(56; 40; 120) = 2³.3.5.7 = 840

Answer 6

D)

84 = 2².3.7

108 = 2².3³

BCNN(84; 108) = 2².3³.7 = 756

Answer 7

E)

45 = 3².5

204 = 2².3.17

126 = 2.3².7

BCNN(45; 204; 126) = 2².3².5.7.17 = 21420

Answer 8

A.BCNN(10,12,15)

Ta có : 10=2x5

12=2x3

15=3x5

=>BCNN(10,12,15)=2x2x3x3x5x5=900

b,BCNN(150,25,175)

Ta có:150=2x3x5^2

25=5^2

175=5^2x7

=>BCNN(150,25,175)=2x3x7x5^2=1050

c.BCNN(56,40,120)

Ta có:56=2^3x7

40=2^3x5

120=2^3x3x5

=>BCNN(56,40,120)=2^3x3x3x5x7=2520

d.BCNN(84,108)

Ta có:84=2^2x3x7

108=2^2x3^3

=>BCNN(84,108)=2^2x3^3x7=756

e.BCNN(45,204,126)

Ta có:45=3^2x5

204=2^2x3x17

126=2x3^2x7

=>BCNN(45,204,126)=2x2^2x3^2x5x17x7=42820

Answer 9

E, 

45 = 3².5

204 = 2².3.17

126 = 2.3².7

BCNN(45; 204; 126) = 2².3².5.7.17 = 21420