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高级中学试验修订本《数学》第二册 (上 )(必修 )Ｐ92和Ｐ1 0 5分别从椭圆和双曲线定义出发 ,得到集合Ｐ ={Ｍ | |ＭＦ1| + |ＭＦ2 |=2ａ}和Ｐ ={Ｍ | |ＭＦ1| - |ＭＦ2 | =± 2ａ},进而又得到(ｘ +ｃ) 2 + ｙ2 + (ｘ -ｃ) 2 + ｙ2 =2ａ( 1 )(ｘ +ｃ) 2 + ｙ2 - (ｘ -ｃ) 2 +
The revision of the Senior High School Test Book “Mathematics” Volume 2 (top) (required) P92 and P1 0 5 starts from the ellipse and hyperbola definitions, respectively, to obtain the set P ={M | |MF1| + |MF2 |=2a} and P ={M | |MF1| - |MF2 | =± 2a}, and in turn gets (x + c) 2 + y2 + (x - c) 2 + y2 = 2a( 1 )(x + c) 2 + y2 - (x -c) 2 +