阅读《浣溪沙》，根据要求回答问题。
                                                                                                                                 浣溪沙
                                                                                                                                   晏殊
                                                                                           一曲新词酒一杯。去年天气旧亭台。夕阳西下几时回？
                                                                                           无可奈何花落去，似曾相识燕归来。小园香径独徘徊。

已知关于x的一元二次方程x²+kx+1=0有两个相等的实数根，则k=____ ．

读“东西半球海陆分布图”，回答下题．