(r-0.09)(3.7908-3.8897)=0.01(3.8462-3.8897)(r-0.09)(3.8897-3.7908)=0.01(3.8897-3.8462)0.0989(r-0.09)=0.0435*0.010.0989r-0.008901=0.0004350.0989r=0.009336r≈0.0944=9.44%
你这题目都不完整,谁也解不了