解:(1)32.5:0.15,
=(32.5×20):(0.15×20),
=650:3;
(2)
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:
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,
=(
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×9):(
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×9),
=2:3;
(3)1:
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,
=(1×4):(
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×4),
=4:3.
分析:(1)根據(jù)比的性質(zhì):把32.5:0.15的前項和后項同時乘上20,即能化成最簡比;
(2)根據(jù)比的性質(zhì):把
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:
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的前項和后項同時乘上9,即能化成最簡比;
(3)根據(jù)比的性質(zhì):把1:
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的前項和后項同時乘上4,即能化成最簡比.
點評:此題考查化簡比的方法,是根據(jù)比的基本性質(zhì)進(jìn)行化簡的,最簡比是指比的前項和后項是互質(zhì)數(shù)的比;要注意區(qū)分:化簡比的結(jié)果仍是一個比;求比值的結(jié)果是一個數(shù).