72+415+236+928+585+265,用简便方法算

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72+415+236+928+585+265,用简便方法算
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72+415+236+928+585+265,用简便方法算
72+415+236+928+585+265,用简便方法算

72+415+236+928+585+265,用简便方法算
72+415+236+928+585+265
=72+928+415+585+236+265
=1000+1000+235+1+265
=2000+235+265+1
=2000+500+1
=2501
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