问题标题:
【高一数学方程综合请详细解答,谢谢!(1217:26:9)正数x,y满足x2-y2=2xy   求  (x-y)(x+y)】
问题描述:
高一数学方程综合请详细解答,谢谢!(1217:26:9)
正数x,y满足x2-y2=2xy 求 (x-y)(x+y)
刘鹰回答:
正数x、y满足正数x、y满足x2-y2=2xy,
x2-y2=2xy
x2-2xy+y2-2y2=0
(x-y)2=2y2
x-y=√2*y
x=(√2+1)y
(x—y)/(xy)==√2*y/(√2+2)y
=√2/(√2+2)
=√2(2-√2)/(4-2)
=√2-1
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