已知a:b:c=4:9:6,且a,b,c的最小更公倍數為144,則a+b+c=?

2016-04-28 11:55 pm

回答 (2)

2016-04-30 2:35 am
a+b+c=4p+9p+6p=19p=76
2016-04-29 12:02 am
Sol
[4,9,6]=2[2,9,3]=2*3[2,3,1]=36
a:b:c=4:9:6
a/4=b/9=c/6=p
a=4p,b=9p,c=6p
[a,b,c]=[4p,9p,6p]=p[4,9,6]=36p=144
p=4
a+b+c=4p+9p+6p=19p=76


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