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0.8:0.122數學公式數學公式45分:1.5時

解:(1)0.8:0.12,
=0.8÷0.12,
=;

(2)2,
=,
=;

(3)45分:1.5時,
=45分:90分,
=45÷90,
=
分析:根據求比值的方法,就用比的前項除以后項即得比值;求45分:1.5時的比值時,先把比的后項1.5時換算成90分,再求比值.
點評:本題主要考查了求比值的方法;注意求比值時先把比的兩項的單位化統(tǒng)一;還要注意求比值的結果是一個商,可以是整數、小數或分數,而化簡比的結果仍是一個比.
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