挖一条水渠,挖了全长的八分之五时,距中点160米,这条水渠全长多少米?(补充条件)___________,___________.挖这条水渠要挖土多少立方米?

问题描述:

挖一条水渠,挖了全长的八分之五时,距中点160米,这条水渠全长多少米?(补充条件)___________,___________.挖这条水渠要挖土多少立方米?

5/8-1/2=1/8
160/(1/8)=160×8=1280(米)
补充条件:如果水渠宽2米,高0.5米
挖这条水渠要挖土:1280×2×0.5=1280(立方米)