7.48-3.51+2.52-1.49= (简便)

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7.48-3.51+2.52-1.49= (简便)
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7.48-3.51+2.52-1.49= (简便)
7.48-3.51+2.52-1.49= (简便)

7.48-3.51+2.52-1.49= (简便)
7.48-3.51+2.52-1.49
=7.48+2.52-(3.51+1.49)
=10-5
=5

(7.48+2.52)-(3.51+1.49)=5

7.48-3.51+2.52-1.49
=7.48+2.52-(3.51+1.49)
=10-5
=5

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