Question

Tìm BCNN:

a, BCNN ( 8, 10, 20 )

b, BCNN (16, 24 )

c,  BCNN ( 60, 140 )

d, BCNN ( 8, 9, 11 )

e, BCNN ( 24, 40, 162 )

f, BCNN ( 56, 70, 162 )

g, BCNN (28, 30 20 ) 

h, BCNN ( 34, 32, 20 )

k, BCNN ( 42, 70, 52 )

I, BCNN ( 9, 10, 11 )

 

Answer 1

Answer 2

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^^