如果方程3(x^2)+(a-5)x+(a^2)-a-2=0的2个实根x1和x2满足0

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如果方程3(x^2)+(a-5)x+(a^2)-a-2=0的2个实根x1和x2满足0

如果方程3(x^2)+(a-5)x+(a^2)-a-2=0的2个实根x1和x2满足0
如果方程3(x^2)+(a-5)x+(a^2)-a-2=0的2个实根x1和x2满足0

如果方程3(x^2)+(a-5)x+(a^2)-a-2=0的2个实根x1和x2满足0
(a²-a-2)(a²-4)<0
(a²+a)(a²-4)<0
解得-2