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1、1. 1000×(40%-35%)=50 50÷40%=125 125+125×35%÷40%=234.375 2. 正在建设中的武广铁路的黄登仙隧道全长700米,如果一列长260米的高速列车完全通过该隧道需要12秒.这高速列车是每小时(288 )千米.从长沙至广州约720千米,需要( 2.5)小时即可到达. 3. 20088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482022460662808864044820224606628088640448202246066280886404482。

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