．实数、在数轴上的位置如图所示，则化简的结果为（） �

．实数、在数轴上的位置如图所示，则化简的结果为（　）

A、　 B、　　C、　 D、

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解析:略

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．实数、在数轴上的位置如图所示，则化简的结果为（ ） �

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．实数、在数轴上的位置如图所示，则化简的结果为（） �