7珠门锁的互开率是多少，怎么计算？抽样门锁50把，50把钥匙对50把锁相互开吗？50把钥匙对另外5 列差奥数题及答案；有50把锁的钥匙搞乱了，为了使每把锁都配上...
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=\uff0849+1\uff09\u00d749\u00f72
=1225\uff08\u6b21\uff09
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