5.49+2.68-3.49 简便计算

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5.49+2.68-3.49 简便计算
5.49+2.68-3.49 简便计算

5.49+2.68-3.49 简便计算
5.49+2.68-3.49 =5.49-3.49+2.68
=2+2.68
=4.68

5.49+2.68-3.49
=5.49-3.49+2.68
=2+2.68
=4.68