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b²;-4ac=4(p+1)²;-4(2p-5) =4(p²;-6p+21) =4(p-3)²;+48>0 ∴p為任意實數. X1+X2=-2(P+1)<0 P>-1 X1·X2=2P-5>0 P>5/2 總上所得:p>5/2
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