已知b>0,直线互相垂直,则ab的最小值等于( ) A.1           

已知b0,直线互相垂直,则ab的最小值等于(  )

A1                              B2    

C2                          D2

答案

解析:由两条直线垂直的充要条件可得:

当且仅当b,即b1时取

答案:B

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