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25×16×0.125=数学公式数学公式=075+数学公式=
8.7÷0.03=4.37+8.8=数学公式+数学公式+数学公式)×12=
0.322=数学公式÷数学公式=数学公式×80%=
4700+800=

25×16×0.125=50,=0.75+=0.95,
8.7÷0.03=290,4.37+8.8=13.17,++)×12=9,
0.322=0.1024,÷=×80%=0.6,
4700+800=5500.


分析:根据小数和分数加减乘除的计算方法进行计算;
25×16×0.125根据乘法交换律和结合律进行计算;
++)×12根据乘法分配律进行计算.
点评:口算时,注意运算符号和数据,然后再进一步计算.
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