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已知-7,,,-1四个实数成等差数列,-4,,,,-1五个实数成
等比数列,则=
已知-7,,,-1四个实数成等差数列,-4,,,,-1五个实数成等比数列,则=
A.1 B.-1 C.2 D.±1
已知-7,,,-1四个实数成等差数列,-4,,,,-1五个实数成等比数列,则=__________.
已知-7,,,-1四个实数成等差数列,-4,,,,-1五个实数成等比数列,则= .