12.75+3.87-2.75=?(简便计算)

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12.75+3.87-2.75=?(简便计算)

12.75+3.87-2.75
=(12.75-2.75)+3.87
=10+3.87
=13.87

12.75+3.87-2.75
=12.75-2.75+3.87
=10+3.87
=13.87