3+0.54=0.65+0.85=0.8×2=
9-0.97=6.3÷0.21=1.25×0.8=
2.4÷1.2=0÷0.8=

解:

3+0.54=3.54,0.65+0.85=1.5,0.8×2=1.6,
9-0.97=8.03,6.3÷0.21=30,1.25×0.8=1,
2.4÷1.2=2,0÷0.8=0.

分析:根據(jù)小數(shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算.
點(diǎn)評(píng):口算時(shí),注意運(yùn)算符號(hào)和數(shù)據(jù),然后再進(jìn)一步計(jì)算.
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直接計(jì)算:
數(shù)學(xué)公式=
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3.6÷24=0.8×1.1=7.2+12.8=46.7-3.8=
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2.4÷0.8=10.8÷9=9.6÷0.8=0.108÷2=
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84÷0.21=0.75÷0.25=2.5×16=0.108÷2=
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