由題意知:a6(a2+2a6+a10)=a6a2+2a6a6+a10a6,
∵a4+a8=-2,
∴a6a2+2a6a6+a10a6=(a4+a8)2=4.
故選B.
已知等比數(shù)列{an},且a4+a8=-2,則a6(a2+2a6+a10)的值為( ?。?A.6 B.4 C.8 D.-9
已知等比數(shù)列{an},且a4+a8=-2,則a6(a2+2a6+a10)的值為( ?。?br/>A. 6
B. 4
C. 8
D. -9
B. 4
C. 8
D. -9
數(shù)學(xué)人氣:766 ℃時(shí)間:2020-05-21 11:53:39
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