15÷________=數(shù)學(xué)公式=1:________=________÷40=________.

24        25    0.625
分析:解答此題的關(guān)鍵是,根據(jù)分數(shù)與除法的關(guān)系,=5÷8,再根據(jù)商不變的性質(zhì),被除數(shù)、除數(shù)都乘3就是15÷24;被除數(shù)、除數(shù)都乘5就是25÷40;根據(jù)比與分數(shù)的關(guān)系,=5:8,再根據(jù)比的基本性質(zhì),比的前、后項都乘就是1:;把化成小數(shù)是5÷8=0.625.由此進行轉(zhuǎn)化并填空.
解答:15÷24==1:=25÷40=0.625;
故答案為:24,,25,0.625.
點評:此題主要是考查除式、小數(shù)、分數(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)進行轉(zhuǎn)化即可.
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