5. (5 分）已知 $\left\{a_{n}\right\}$ 为等比数列, $a_{4}+a_{7}=2, a_{5} a_{6}=-8$, 则 $a_{1}+a_{10}=(\quad)$
Gaokao · Math · previous-year question
- A.7
- B.5
- C.-5
- D.-7
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