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有兩種情况一、a^2+a-4=2;a^2+1=3;a^2+a-4≠a^2+1;2a+1≠-2;a^2+a-4≠-2;a^2+1≠-2得出結果為a=-3二、a^2+1=2;a^2+a-4≠3;a^2+a-4≠2a+1;2a+1≠-2;a^2+a-4≠-2;a^2+1≠-2得出結果為a=-1最後為a=-…
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