对!
也可以先算出整个的面积,再减去不挖的面积,再乘以深度.
[36×10-(36-3)×(10-2)]×0.8
=(360-33×8)×0.8
=(360-264)×0.8
=96×0.8
=76.8
答:挖出的土有76.8立方米.