问题 填空题
化简下列各比:
(1)
12
18
=______
(2)3.6:7.2:4.8=______
(3)
1
3
:2:0.5=______.
(4)120分钟:1.2小时:1小时20分钟=______.
答案

(1)

12
18
=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)

1
3
:2:0.5,

=(

1
3
×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;

故答案为:2:3;3:6:4;2:12:3;15:9:10.

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