等式4.16/44.84=(9%-R)/(9%-10%) 可化为:2.08/11.21=(0.09-R)/(-0.01)即2.08/11.21=(R-0.09)/0.012.08*0.01=11.21R-11.21*0.0911.21R=0.0208+ 1.008911.21R=1.0297R=1.0297÷11.21≈0.0919