口算.
45×0.2=0.88÷0.44=2-1.2=12.5×0.8=(1.5+0.25)×4=
4.5÷0.9=8.5×10=5.2÷0.2=1.2×6=12-6.5-3.5=

解:45×0.2=9,0.88÷0.44=2,2-1.2=0.8,12.5×0.8=10,(1.5+0.25)×4=7,
4.5÷0.9=5,8.5×10=8.5,5.2÷0.2=26,1.2×6=7.2,12-6.5-3.5=2.

分析:本題根據(jù)小數(shù)乘法、除法、減法的運(yùn)算法則計(jì)算即可.
(1.5+0.25)×4可根據(jù)乘法分配律計(jì)算;
12-6.5-3.5可根據(jù)一個(gè)數(shù)減兩個(gè)數(shù),等于減去這兩個(gè)數(shù)的和的減法性質(zhì)計(jì)算.
點(diǎn)評(píng):完成此類題目要細(xì)心,在保證做題質(zhì)量的同時(shí),要注意提高做題的速度.
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