口算.
56+47=12.6÷3=0.36÷0.9=910+70=
0.25×0.4=數(shù)學(xué)公式×數(shù)學(xué)公式=16×5=1÷0.25=
數(shù)學(xué)公式+數(shù)學(xué)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
故答案為:103,4.2,0.4,980,0.1,,80,4,,12.8.
分析:按照運(yùn)算法則進(jìn)行計(jì)算.
點(diǎn)評:本題是基本的運(yùn)算題目,注意計(jì)算時(shí)小數(shù)的位數(shù).
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