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3
2
3
2
×
2
3
=
5
8
5
8
÷
5
8
=0.2×
5
5
=25×
1
25
1
25
=1.
分析:根据倒数的意义,乘积是1的两个数互为倒数,两个相同的数(0除外)相除商是1,由此解答.
解答:解:
2
3
的倒数是
3
2
,0.2的倒数是5,25的倒数是
1
25
5
8
÷
5
8
=1;
3
2
)×
2
3
=(
5
8
÷
5
8
=0.2×(5)=25×(
1
25
)=1.
故答案为:
3
2
5
8
,5,
1
25
点评:此题主要考查分数乘法、除法的计算,根据倒数的意义,和求一个数的倒数方法解决问题.
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