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已知\(f\left( x \right)\)是偶函数，当\(x < 0\)时，\(f\left( x \right) = x\left( {x + 1} \right)\)，则当\(x > 0\)时，\(f\left( x \right) = \)___．
参考答案：\(x\left( {x - 1} \right)\)
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