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等差数列An,若A10+A11+A12=-3,A10A11A12=3,求An
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等差数列An,若A10+A11+A12=-3,A10A11A12=3,求An
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答案和解析
A10+A12=2A11
3A11=-3
A11=-1
所以,A10*A12=-3
A10+A12=-2
1,A10=-3,A12=1, An=2n-23
2,A10=1,A12=-3, An=-2n+21
3A11=-3
A11=-1
所以,A10*A12=-3
A10+A12=-2
1,A10=-3,A12=1, An=2n-23
2,A10=1,A12=-3, An=-2n+21
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