127+28               57÷19              0.3×0.3             數(shù)學公式+0.75
1數(shù)學公式×數(shù)學公式÷1數(shù)學公式×數(shù)學公式數(shù)學公式×數(shù)學公式( 0.25-數(shù)學公式)×數(shù)學公式數(shù)學公式÷數(shù)學公式
數(shù)學公式+0.69+1數(shù)學公式18×2數(shù)學公式

解:

127+28=155,57÷19=3,0.3×0.3=0.09,+0.75=1,
1×÷1×=,×=1,( 0.25-)×=0,÷=,
+0.69+1=2.69,18×2=38.


分析:1×÷1×先把除法變成乘法,然后根據(jù)乘法結合律簡算;1÷×先把除法變成乘法,然后根據(jù)乘法結合律簡算;( 0.25-)×先算小括號里面的簡算,然后根據(jù)0乘任何數(shù)都得0計算;+0.69+1運用加法交換律簡算;其它題目根據(jù)運算法則直接求解.
點評:完成本題要注意分析式中數(shù)據(jù),運用合適的簡便方法計算.
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