幫下我計H.C.F&L.C.M(20.30.40)(30.54.72)急急急AR!

1) 20,30,40
L.C.M = 120
H.C.F. = 10

2.) 30,54,72
L.C.M = 1080
H.C.F. = 6

20的倍數:20-40-60-80-100-120...
30的倍數:30-60-90-120...
40的倍數:40-80-120...
20,30,40LCM=120

20的因數:1,2,4,5,10,20
30的因數:1,2,3,5,6,10,15,30
40的因數:1,2,4,5,8,10,20,40
20,30,40HCF=10

2007-10-09 19:16:33 補充：
----版權所有 複製必究----

2007-10-10 18:08:09 補充：
30的倍數:20,40,60.............108054的倍數:54,108,162..........108072的倍數:72,144.................1080

2007-10-10 18:10:00 補充：
30的因數:1,2,3,5,6...54的因數:1,2,3,6...72的因數:1,2,3,4,6...

2007-10-10 18:10:45 補充：
30,54,72LCM=1080HCF=6

2007-10-10 18:11:06 補充：
----版權所有 複製必究----

(1) 20,30,40
20=10x2
30=10x3
40=10x4
L.C.M=10x2x3x4
L.C.M = 120
H.C.F. = 10


(2.) 30,54,72
30=2x3x5
54=2x3x3x3
72=2x2x2x3x3
L.C.M.=2x2x2x3x3x3x5
=1080
H.C.F. = 6