化简下列各比:
(1)=______?????
(2)3.6:7.2:4.8=______
(3):2:0.5=______.
(4)120分钟:1.2小时:1小时20分钟=______.
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解:(1)=12:18,
=(12÷6):(18÷6),
=2:3;
(2)3.6:7.2:4.8,
=(3.6×10):(7.2×10):(4.8×10),
=36:72:48,
=(36÷12):(72÷12):(48÷12),
=3:6:4;
(3):2:0.5,
=(×6):(2×6):(0.5×6),
=2:12:3,
(4)120分钟:1.2小时:1小时20分钟,
=120分钟:72分钟:80分钟,
=120:72:80,
=(120÷8):(72÷8):(80÷8),
=15:9:10;
故