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若x=根号n+1-根号n/根号n+1+根号n,y=根号n+1+根号n/根号n+1-根号n且10x^2+10y^2-12xy若x=根号n+1-根号n/根号n+1+根号n,y=根号n+1+根号n/根号n+1-根号n且10x^2+10y^2-12xy+80=2008n=?

题目详情
若x=根号n+1-根号n/根号n+1+根号n,y=根号n+1+根号n/根号n+1-根号n 且10x^2+10y^2-12xy
若x=根号n+1-根号n/根号n+1+根号n,y=根号n+1+根号n/根号n+1-根号n
且10x^2+10y^2-12xy+80=2008 n=?
▼优质解答
答案和解析
x=根号n+1-根号n/根号n+1+根号n,y=根号n+1+根号n/根号n+1-根号nx=(√n+1-√n)/(√n+1+√n)y=(√n+1+√n)/(√n+1-√n)x+y=4n+2xy=110x²+10y²-12xy+80=200810x²+10y²+20xy-32xy=192810(x²+2x...