數(shù)學(xué)公式-0.01=2數(shù)學(xué)公式+數(shù)學(xué)公式=27數(shù)學(xué)公式÷9=數(shù)學(xué)公式-數(shù)學(xué)公式)×12=0.39÷2數(shù)學(xué)公式=2數(shù)學(xué)公式+5.75=
1數(shù)學(xué)公式÷1數(shù)學(xué)公式=7-7÷9=數(shù)學(xué)公式×1.8=0.6÷數(shù)學(xué)公式=2.1÷0.35=1數(shù)學(xué)公式÷1+0.15=

解:
-0.01=0.09,2+=2,27÷9=3-)×12=1,0.39÷2=0.15,2+5.75=7.95,
1÷1=,7-7÷9=6×1.8=1.2,0.6÷=1,2.1÷0.35=6,1÷1+0.15=1.3.

分析:根據(jù)分?jǐn)?shù)和小數(shù)加減乘除的計(jì)算方法進(jìn)行計(jì)算即可.
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)算即可.
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