4.28+1.39-1.28的简便计算

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4.28+1.39-1.28的简便计算
4.28+1.39-1.28的简便计算

4.28+1.39-1.28的简便计算
4.28-1.28+1.39=3+1.39=4.39

4.28-1.28+1.39=4.39

4.28-1.28+1.39=3+1.39=4.39
4.28+(1.39-1.28)=4.28+0.11=4.39
4.28-1.28+1.39=3+1.39=4.39
4.28+(1.39-1.28)=4.28+0.11=4.39

4.28-1.28+1.39=3+1.39=4.39
4.28+(1.39-1.28)=4.28+0.11=4.39

先用4.28-1.28=3再用3+1.39=4.39 就是加法交换律

（4.28-1.28）+1.39
=3+1.39
=4.39

4.28+1.39-1.28=(4.28-1.28)+1.39=3+1.39=4.49

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