设双曲线方程为mx^2-ny^2=1,其中1/m+1/n=9联立方程：x+y-1=0mx^2-ny^2=1消元得:(m-n)x^2+2nx-n-1=0；则判别式=4n^2+4(m-n)(n+1)>=0即4mn+4m-4n>=0也就是1+1/n-1/m>=0,由1/m+1/n=9得1+9-2/m>=0因此,2/m...