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已知关于x的一元二次方程x2+kx-1=0．是否存在实数k，使得方程的两根分别为x1，x2，且满足x1+x2=x1·x2，若有，求出k的值；若没有，请说明理由．
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Iliveinthecountryandmyfatherwasafarmer.51.______Heisnowforty-fiveyearold.Becauseofyearsof52.______hardworkhelooksoldthanhisage.WhenIwas53.______youngheisusedtotellmetheimportanceofstudy.54.______FatherknowslittleaboutEnglishandothersubjects55.______butheusuallygivesmesomegoodadvicesonhow56.______tolearnmylessonsgood.Heisnotonlykindtome57.______butalsoverystrictinme.WithhishelpI’vemade58.______greatprogress.I’llnevertoforgetwhathetaught59.______me.Ithinkmyfatherisbestfatherintheworld.60.______
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