∵y与(x-0.4)成反比例
∴设y=k/(x-0.4)
∵x=0.65时,y=0.8
∴k=(0.65-0.4)×0.8=0.2
∴y=1/(5x-2)
(y+1)(x-0.3)=1(0.8-0.3)×(1+20%)
解得:x1=0.6,x2=0.5(不合题意,舍去)
∴x=0.6
∵y与(x-0.4)成反比例
∴设y=k/(x-0.4)
∵x=0.65时,y=0.8
∴k=(0.65-0.4)×0.8=0.2
∴y=1/(5x-2)
(y+1)(x-0.3)=1(0.8-0.3)×(1+20%)
解得:x1=0.6,x2=0.5(不合题意,舍去)
∴x=0.6