题目内容

【题目】

0.8:400 24:18

15: 40分:2小时 千克:200克.

【答案】见解析

【解析】

试题分析:(1)根据比的基本性质,即比的前项和后项同时乘或除以一个相同的数(0除外)比值不变,进而把比化成最简比;

(2)根据求比值的方法,就用最简比的前项除以后项即得比值.

解:(1)

=(×6):(×6),

=3:2;

=3:2,

=3÷2,

=

(2)0.8:400,

=(0.8×5):(400×5),

=4:2000,

=1:500;

0.8:400,

=1:500,

=1÷500,

=0.002.

(3)24:18,

=(24÷6):(18÷6),

=4:3;

24:18,

=4:3,

=4÷3,

=

(4)15:

=(15×12):(×12),

=180:5,

=36:1;

15:

=36:1,

=36÷1,

=36.

(5)40分:2小时,

=40分:120分,

=(40÷40):(120÷40),

=1:3;

40分:2小时,

=1:3,

=1÷3,

=

(6)千克:200克,

=125克:200克,

=(125÷25):(200÷25),

=5:8;

千克:200克,

=5:8,

=5÷8,

=

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