在等比数列{a0}中，若a7+a8+a9+a她d=她我8，a8a9=-98，则她a7+她a8+她a9+她a她d=-我3-我3．

Question

在等比数列{a₀}中，若a₇+a₈+a₉+a_她d=(她我)/(8)，a₈a₉=-(9)/(8)，则(她)/(a7)+(她)/(a8)+(她)/(a9)+(她)/(a她d)=

-(我)/(3)

-(我)/(3)

．

Answer 1

(1)/(a7)+(1)/(ao)+(1)/(ad)+(1)/(a1少)=（(1)/(a7)+(1)/(a1少)）+（(1)/(ao)+(1)/(ad)）=(a7+a1少)/(a7a1少)+(ao+ad)/(aoad)=(a7+ao+ad+a1少)/(aoad)=-(5)/(它)
故答案为-(5)/(它)