“q>1”推不出“a(n+1)>an"
如:an=-2^n,q=2>1
但a(n+1)an"推不出“q>1”
如:an=-(1/2)^n,a(n+1)>an,但:q=1/2
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“q>1”推不出“a(n+1)>an"
如:an=-2^n,q=2>1
但a(n+1)an"推不出“q>1”
如:an=-(1/2)^n,a(n+1)>an,但:q=1/2