口算
65+37×0=28×0÷54=4×28×25=100×3÷100×3=
25×28=50-25÷5=2.7×0.03=2.4÷0.06=
4.2÷3=1×0.94=1.2×0.8=0.39÷1.3=
1-數(shù)學公式=數(shù)學公式+數(shù)學公式=數(shù)學公式-數(shù)學公式=數(shù)學公式+數(shù)學公式=

解:
65+37×0=6528×0÷54=04×28×25=2800100×3÷100×3=9
25×28=70050-25÷5=452.7×0.03=0.0812.4÷0.06=40
4.2÷3=1.41×0.94=0.941.2×0.8=0.960.39÷1.3=0.3
1-=+=1-=+=

分析:根據(jù)整數(shù)、分數(shù)加減乘除法的計算方法進行解答即可;
4×28×25運用乘法交換律簡算.
點評:此題考查了整數(shù)、分數(shù)加減乘除法的口算能力,注意運算符號,認真計算即可.
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