已知-9,a
1,a
2,-1四个实数成等差数列,-9,b
1,b
2,b
3,-1五个实数成等比数列,则b
2(a
2-a
1)=( )
A. 8
B. -8
C. ±8
D.
人气:381 ℃ 时间:2020-04-16 09:48:03
解答
由题得
−=d==,=9,
又因为b
2是等比数列中的第三项,所以与第一项同号,即b
2=-3
∴b
2(a
2-a
1)=-8.
故选 B.
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