题目

阅读理解Your 2019 Reading List, Provided by Bill GatesDo you want to be a billionnaire? Most of us can't live like billionaire Microsoft co-founder Bill Gates, but we can read like him. Gates recommended four books in 2019—though some were published earlier.Leonardo da Vinci, by Walter Isaacson (2018)The bestselling biographer of Steve Jobs and Albert Einstein researched deeply into da Vinci's contributions beyond art, highlighting the breadth of his scientific, technological, and creative output. Leonardo nearly understood almost all of what was known on the planet at the time. That's m已知椭圆E的方程是（a＞b＞0），其左顶点为（-2，0），离心率e=．（1）求椭圆E的方程；（2）已知倾斜角为45°且过右焦点的直线l交椭圆E于A、B两点，若椭圆上存在一点P，使=λ（+），试求λ的值．