4÷5=2÷
2.5
2.5
=
8( )
=
0.8
0.8
填小數(shù).
分析:解答此題的突破口是4÷5,根據(jù)商不變的性質(zhì),被除數(shù)、除數(shù)都除以2就是2÷2.5;根據(jù)分?jǐn)?shù)與除法的關(guān)系,4÷5=
4
5
,根據(jù)分?jǐn)?shù)的基本性質(zhì),分子、分母都乘2就是
8
10
;4÷5=0.8.由此進(jìn)行轉(zhuǎn)化并填空.
解答:解:4÷5=2÷2.5=
8
10
=0.8;
故答案為:2.5,10,0.8.
點(diǎn)評(píng):此題主要是考查除式、小數(shù)、分?jǐn)?shù)之間的關(guān)系及轉(zhuǎn)化,利用它們之間的關(guān)系和性質(zhì)進(jìn)行轉(zhuǎn)化即可.
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