Question

Answer 1

\(a,15=3.5\\ 54=2.3^3\\ \Rightarrow BCNN\left(15,54\right)=2.3^3.5=270\\ b,60=2^2.3.5\\ 100=2^2.5^2\\ 140=2^2.5.7\\ \Rightarrow BCNN\left(60,100,140\right)=2^2.3.5^2.7=2100\)

Answer 2

a) 3

Answer 3

a)270

b)2100

Answer 4

^_a,15=3.5

^_54=2.33

^{_{⇒BCNN(15,54)=2.33.5=270}}

^_b,60=22.3.5

^_100=22.52

^_140=22.5.7

^{_{⇒BCNN(60,100,140)=22.3.52.7=2100}}

Answer 5

a. Ta có:

15 = 3 . 5

54 = 2 . 3³

BCNN (15; 54) = 2 . 3³ . 5 = 270 

b. Ta có:

60 = 2² . 3 . 5

100 = 2² . 5²

140 = 2² . 5 . 7

BCNN (60; 100; 140) = 2² . 3 . 5² . 7 = 2100