d=6.28÷5÷3.14=0.4(dm)
r=0.4÷2=0.2(dm)
V=0.2×0.2×3.14×(5+8)
=0.1256×13
=1.6328(立方分米)
1.6328立方分米=1.6328升
答:油罐加高后的容积是1.6328升 .