题干
如图，分别过点Pi（i，0）（i=1、2、…、n）作x轴的垂线，交 y=
x2 的图象于点Ai，交直线 y=
x 于点Bi．则
+
+⋯+
=____．
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答案(点此获取答案解析）
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- Do you like monkeys? -Yes, I do. They're cute.