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[" The two circles "x^(2)+y^(2)=ax" and ...

[" The two circles "x^(2)+y^(2)=ax" and "x^(2)+y^(2)=c^(2)(c>0)],[" touch each other,if "],[[" (1) "|a|=2c," [AlEEE-2011] "],[" (2) "2|a|=c]]

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