一個數(shù)和它倒數(shù)的乘積是________;________的倒數(shù)是5;0.5的倒數(shù)是________.
1
2
分析:兩個數(shù)的乘積是1,它們就互為倒數(shù);先把小數(shù)化為分數(shù),再運用倒數(shù)的求法解答.
解答:一個數(shù)和它倒數(shù)的乘積是1;
5的倒數(shù)是
;
0.5=
,它的倒數(shù)是2;
故答案為:1,
,2.
點評:此題考查倒數(shù)的意義和求法:乘積是1的兩個數(shù)互為倒數(shù),一般在求小數(shù)的倒數(shù)時,先把小數(shù)化為分數(shù)再求解.