=(1)3:2:1(2)42:35:60(3)50:17:90(4)80:147:105(5)a:b:c=20:36:45(6)a:b:c=2:3:2
化简比 (1)90:60:30 (2)3/2:5/4:15/7 (3)2.5:0.75:4.5 (
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