4﹕
5
5
(16)
20
4
5
﹦20÷
25
25
80
80
%
分析:解答此題的突破口是
4
5
,根據(jù)分?jǐn)?shù)的基本性質(zhì),分子、分母都乘4就是
16
20
;根據(jù)比與除法的關(guān)系,
4
5
=4:5;根據(jù)分?jǐn)?shù)與除法的關(guān)系,
4
5
=4÷5,再根據(jù)商不變的性質(zhì),被除數(shù)、除數(shù)都乘5就是20÷25;
4
5
=4÷5=0.8,把0.8的小數(shù)點(diǎn)向右移動(dòng)兩位,添上百分號(hào)就是80%.由此進(jìn)行轉(zhuǎn)化并填空.
解答:解:4:5=
16
20
=
4
5
=20÷25=80%;
故答案為:5,16,25,80.
點(diǎn)評(píng):此題主要是考查除式、分?jǐn)?shù)、百分?jǐn)?shù)、比之間的關(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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