解不等式:l2x^2-5x-1l

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解不等式:l2x^2-5x-1l解不等式:l2x^2-5x-1l解不等式:l2x^2-5x-1l/>l2x^2-5x-1l-3-39/16所以3/4或-根号57/4

解不等式:l2x^2-5x-1l
解不等式:l2x^2-5x-1l

解不等式:l2x^2-5x-1l


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l2x^2-5x-1l<3
-3<2x^2-5x-1<3
-3<2(x-5/4)^2-25/8-1<3
9/16<(x-5/4)^2<57/16
所以3/4或-根号57/4