某县今年粮食产量比去年增加12%,粮食播种面积增加9%,粮食作物单位面积产量的变动如何?

问题描述:

某县今年粮食产量比去年增加12%,粮食播种面积增加9%,粮食作物单位面积产量的变动如何?

(1+12%)/(1+9%)-1
=1.12/1.09-1
=1.027523-1
=0.027523
=2.75%
(答略)