已知:m^2=5m+1,n^2=5n+1,且m不等于n,求(m^2+n^2)/mn的值

问题描述:

已知:m^2=5m+1,n^2=5n+1,且m不等于n,求(m^2+n^2)/mn的值

∵m²=5m+1,n²=5n+1∴m²-n²=5m+1-(5n+1)∴(m-n)(m+n)=5(m-n)∴m+n=5 又∵m²=5m+1∴m=(5m+1)/m又∵n²=5n+1∴n=(5n+1)/n∴mn=(5m+1)/m*(5n+1)/n∴1=(5m+1)(5n+1)∴1=25m...