本课配套习题挑战模式1/5

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单选题
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1.在某次聚会上,每两人都握了一次手,所有人共握手10次,设有x人参加这次聚会,则列出方程正确的是(  )
A: x(x-1)=10
B:
C: x(x+1)=10
D:
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  • 提示2IOiAjOavj+S4pOS4quS6uumDveaPoeS6huS4gOasoeaJi++8jOWboOatpOimgeWwhumHjeWkjeiuoeeul+eahOmDqOWIhumZpOWOuw==
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