你好 涉及到的是财管知识
当r=10%时 59/(1+10%)+59/(1+10%)^2+59/(1.1)^3+59/(1.1)^4+1309/(1.1)^5=999.808073219
当r=9%时 59/1.09+59/1.09^2+59/1.09^3+59/1.09^4+1309/1.09^5=1041.90365741
(r-9%)/(10%-9%)=(1000-1041.9037)/(999.8081-1041.9037)
r=(1000-1041.9037)/(999.8081-1041.9037)*1%+9%=0.0999544132878