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,
=.
练习册系列答案
相关题目