a:b=2:3,b:c=4:5求a:b:
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a:b=2:3,b:c=4:5求a:b:
a:b=2:3,b:c=4:5求a:b:
a:b=2:3,b:c=4:5求a:b:
a:b=2:3=8:12
,b:c=4:5=12:15
a:b:c=8:12:15
a:b=2;3=8:12
b:c=4:5=12:15
a:b:c=8:12:15
a:b=2:3=8:12
b:c=4:5=12:15
故a:b:c=8:12:15
a:b=2:3=8:12
,b:c=4:5=12:15
a:b:c=8:12:15