2020-06-28
展开全部
简便计算过程如下
13.55-(3.55+2.8)
=13.55-3.55-2.8
=10-2.8
=7.2
13.55-(3.55-2.8)
=13.55-3.55+2.8
=10+2.8
=12.8
望采纳
13.55-(3.55+2.8)
=13.55-3.55-2.8
=10-2.8
=7.2
13.55-(3.55-2.8)
=13.55-3.55+2.8
=10+2.8
=12.8
望采纳
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