分析:解答此題的關(guān)鍵是抓住
,分子分母同時(shí)乘6可得
,寫(xiě)成除法算式是2÷5,計(jì)算出結(jié)果是小數(shù)0.4,由此即可填空.
解答:解:根據(jù)題干分析可得:
=2÷5=
=0.4;
故答案為:2;5;30;0.4.
點(diǎn)評(píng):題主要考查分?jǐn)?shù)基本性質(zhì)的應(yīng)用,分?jǐn)?shù)與除法的聯(lián)系和分?jǐn)?shù)化成小數(shù)的方法.
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