精英家教网 > 小学数学 > 题目详情
2
5
=
6
6
÷15=
8
()
=12÷
30
30
=
0.4
0.4
(小数).
分析:抓住
2
5
,利用比与分数、除法之间的关系即可进行解答:
(1)2看做被除数,5是除数,除数从5到15,是乘3,要使商不变,被除数2也要乘3,得6;
(2)分子2到8是乘4,要使分数大小不变,分母5也乘4,得20;
(3)被除数2到12是乘6,要使商不变,除数5也要乘6,得30;
(4)2除以5,计算结果用小数表示,由此即可填空.
解答:解:根据题干分析可得:
2
5
=6÷15=
8
20
=12÷30=0.4;
故答案为:6;20;30;0.4.
点评:此题考查了比与分数、除法之间的关系的灵活应用,根据分数的基本性质,商不变的性质和比的基本性质进行解答.
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