Question

bội chung của 12, 15,18

Answer 1

12 = 2².3                                15 = 3.5                                       18 = 2.3²

BCNN(12, 15, 18) = 2².3².5 = 180

BC(12, 15, 18) = B(180) = {0; 180; 360; ...}

tick nhé

 

Answer 2

\(12=2^2.3;15=3.5;18=2.3^2\Rightarrow BCNN\left(12,15,18\right)=2^2.3^2.5=180\)

\(\Rightarrow BC\left(12,15,18\right)=B\left(180\right)=\left\{0;180;360;540;720;...\right\}\)