4
5
×0=
4
5
×
5
4
=
4
5
÷
4
5
=
4
5
÷
5
4
=
分析:根據(jù)分數(shù)四則乘法、除法的計算法則直接進行口算.
解答:解:
4
5
×
0=0;
4
5
×
5
4
=1;
4
5
÷
4
5
=1;
4
5
÷
5
4
=
16
25

故答案為:0;1;1;
16
25
點評:此題主要考查分數(shù)乘法、除法的口算,根據(jù)分數(shù)乘法、除法的計算法則和0在乘法運算中的特性,0乘任何數(shù)都得0,兩個相同的數(shù)相除商是1,直接進行口算.
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