如题所述
5.27-1.72+4.73-3.28
=(5.27+4.73)-(1.72+3.28)
=10-5
=5
=(5.27+4.73)-(1.72+3.28)
=10-5
=5
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第1个回答 2020-07-02
=(5.27+4.73)-(1.72+3.28)
=10-5
=5
加法结合律
=10-5
=5
加法结合律