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Mathematics answer of the college entrance examination 20 1 1 Jiangxi
y0/(x0-a)? Y0/(x0+a)= 1/5 can be converted into y0? /(x0? -a? )= 1/5

Finally, to simplify: x0? -a? =5y0? ①

And then go to x0? /a? -What about you? /b? = 1 simplified b? x0? -a? y0? =a? b? ②

Get 5b while eliminating x0? y0? +a? b? -a? y0? =a? b?

Eliminate y0 on both sides? What about a? b? Get 5b? =a?