6,15的第5個公倍數

6,15的第5個公倍數是 150


6倍數(150以內) 6 12 18 24 30 36 42 48 54 60 66 72 78 94 100 .......150

15倍數(150以內) 15 30 45 60 75 .....105 120 135 150.......


so 16,15的第5個公倍數是 150!!!

6,15的公倍數為30,60,90,120,150
所以第5個公倍數係150

615的第5個公倍數是:105

[6,15]=[2×3,3×5]=2×3×5=30

30×5=150...Ans

我用英文回答吧!
you can try to think what they common

6 can be divied by:1,2,3,6

15 can be divied by:1,3,5,15

look! they are 3's factors so 6*15/3=90/3=30,so 150 is wrong.

6,15的第5個公倍數:150
hope that I am right la~