25×16×0.125=數(shù)學(xué)公式數(shù)學(xué)公式=075+數(shù)學(xué)公式=
8.7÷0.03=4.37+8.8=數(shù)學(xué)公式+數(shù)學(xué)公式+數(shù)學(xué)公式)×12=
0.322=數(shù)學(xué)公式÷數(shù)學(xué)公式=數(shù)學(xué)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:根據(jù)小數(shù)和分?jǐn)?shù)加減乘除的計算方法進行計算;
25×16×0.125根據(jù)乘法交換律和結(jié)合律進行計算;
++)×12根據(jù)乘法分配律進行計算.
點評:口算時,注意運算符號和數(shù)據(jù),然后再進一步計算.
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