Question

BCNN( 120,40)

 

Answer 1

Ta có : 120 = 2³ * 3 * 5

           40 = 2³ * 5

=> BCNN(120;40) = 2³ * 5 * 3 = 8 *5 * 3 = 120

Vậy BCNN(120;40) =120

Answer 2

Ta có :120=2³.3.5 ; 40=2³.5

=>BCNN(120;40)=2³.5=40

Answer 3

Ta có : 120 = 2³ . 3.5 : 40 = 2³ . 5

=> BCNN ( 120 : 40 ) 2³.5 = 40

Answer 4

120=2^3*3*5

40=2^3*5

suy ra BCNN(120,40)=2^3*3*5=120