4+4.73=________數(shù)學(xué)公式÷9=________數(shù)學(xué)公式×數(shù)學(xué)公式÷數(shù)學(xué)公式×數(shù)學(xué)公式=________數(shù)學(xué)公式-4 數(shù)學(xué)公式=________
375÷1 數(shù)學(xué)公式=________數(shù)學(xué)公式×2÷數(shù)學(xué)公式×2=________36+0.4=________5×32×2.5=________
1÷0.9=________8×(12+0.5)=________數(shù)學(xué)公式=________ 數(shù)學(xué)公式=________
數(shù)學(xué)公式=________數(shù)學(xué)公式=________數(shù)學(xué)公式=________數(shù)學(xué)公式=________
數(shù)學(xué)公式=________數(shù)學(xué)公式=________數(shù)學(xué)公式=________數(shù)學(xué)公式=________
數(shù)學(xué)公式=________數(shù)學(xué)公式=________數(shù)學(xué)公式=________數(shù)學(xué)公式=________
35+0.4=________8×(12+0.5)=________4×0.8×2.5×12.5=________數(shù)學(xué)公式=________
數(shù)學(xué)公式=________數(shù)學(xué)公式=________.

8.73                    4    36.4    400        100    8                5.925    12        2            5.7    3            35.4    100    100    20        1110

分析:×÷×,×2÷×2,先把除法變成乘法,再根據(jù)乘法結(jié)合律簡算;
5×32×2.5先把32分解成8×4,再運(yùn)用乘法結(jié)合律簡算;
運(yùn)用加法結(jié)合律簡算;
4×0.8×2.5×12.5運(yùn)用乘法結(jié)合律簡算;
先算乘法,再根據(jù)連續(xù)減去兩個數(shù)等于減去這兩個數(shù)的和簡算;
先去掉小括號,然后再根據(jù)加法結(jié)合律簡算,最后算括號外的乘法;
先把分解成,然后再運(yùn)用加法結(jié)合律簡算;
其它題目根據(jù)運(yùn)算法則直接求解.
解答:

4+4.73=8.73,÷9=,×÷×=,4-4=,
375÷1=×2÷×2=4,36+0.4=36.4,5×32×2.5=400,
1÷0.9=8×(12+0.5)=100,=8,=,
==,=5.925,=12,
==2,=,=,
=5.7,=3,=,=,
35+0.4=35.4,8×(12+0.5)=100,4×0.8×2.5×12.5=100,=20,
=,=1110.


點(diǎn)評:本題注意簡算方法的運(yùn)用,運(yùn)算定律是常用的簡便運(yùn)算的方法,要熟練掌握,靈活運(yùn)用.

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