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若函数\(f\left( x \right) = \left\{ {\begin{array}{*{20}{l}} { - {x^2} + x,x > 0} \\ {0,x = 0} \\ {a{x^2} + x,x < 0} \end{array}} \right.\)是奇函数，则实数\(a\)的值为___.
参考答案：1
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