400-600-1123
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答案：
E
题目说的是
：P（9到55之间）=两个质数相乘。
质数x：2<6 那就是3或者5="" 质数y:13<25.="" y可以取的值有：17="" 19="" 23="" 9<55="" 带入：3*17="51" 3*19="57" 这就错了="" 已经不能满足<55这个点了="" 那其他就不用带入了="" <="" div="">
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