5
9
×8=
5?8
9?8
=
40
72
×
×
分析:分?jǐn)?shù)乘整數(shù),把分子與整數(shù)相乘的積做分子,分母不變,能約分的要約分.
解答:解:
5
9
×8=
5×8
9
=
40
9

故答案為:×.
點評:掌握分?jǐn)?shù)乘整數(shù)的運算法則,是解題的關(guān)鍵.
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