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若互不相等的实数a,b,c成等差数列,c,a,b成等比数列,且a+3b+c=10...
若互不相等的实数a,b,c成等差数列,c,a,b成等比数列,且a+3b+c=10,则a=( )
A.4
B.2
C.-2
D.-4
考点分析:
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