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口算.
56+47=12.6÷3=0.36÷0.9=910+70=
0.25×0.4=数学公式×数学公式=16×5=1÷0.25=
数学公式+数学公式=12+0.8=

解:56+47=10312.6÷3=4.20.36÷0.9=0.4910+70=980
0.25×0.4=0.1×=16×5=801÷0.25=4
+=12+0.8=12.8
故答案为:103,4.2,0.4,980,0.1,,80,4,,12.8.
分析:按照运算法则进行计算.
点评:本题是基本的运算题目,注意计算时小数的位数.
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