98.49-65.82+72.51-12.12 怎么简便计算

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98.49-65.82+72.51-12.12 怎么简便计算
98.49-65.82+72.51-12.12 怎么简便计算

98.49-65.82+72.51-12.12 怎么简便计算
98.49-65.82+72.51-12.12 =98.49+72.51-12.12 -65.82=98+72+0.49+0.51-﹙12.12 +65.82﹚
=171-﹙12+65+0.12+0.82﹚=171-﹙77+0.94﹚=94-0.94=93.06

=(98.49+75.51)-(65.82+12.12)
=174-77.94
=96.06

98.49-65.82+72.51-12.12
=(98.49+72.51)-(65.82+12.12)
=171-77.94
=96.06
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