解:M=|向量AP|/|向量PB|=(|AB|-|PB|/|PB|=|AB|/|PB|-1
由于|AB|是定值,所以当|PB|最小即当|PB|=|AB|/(n+1)时,M取最大值n,
当|PB|最大即当|PB|=|AB|*n/(n+1)时,M取最小值1/n,
解:M=|向量AP|/|向量PB|=(|AB|-|PB|/|PB|=|AB|/|PB|-1
由于|AB|是定值,所以当|PB|最小即当|PB|=|AB|/(n+1)时,M取最大值n,
当|PB|最大即当|PB|=|AB|*n/(n+1)时,M取最小值1/n,