如题所述
利用加法的交换律和结合律,
7.8➖7.5➕2.2➖2.5
=(7.8+2.2)-(7.5+2.5)
=10-10
=0
7.8➖7.5➕2.2➖2.5
=(7.8+2.2)-(7.5+2.5)
=10-10
=0
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第1个回答 2020-06-12
7.8-7.5+2.2-2.5
=(7.8+2.2)-(7.5+2.5)
=10-10
=0
=(7.8+2.2)-(7.5+2.5)
=10-10
=0