解：40厘米=0.4米60厘米=0.6米3.14×（0.4÷2）²×2+3.14×0.4×0.6=3.14×0.04×2+0.7536=0.2512+0.7536=1.0048（平方米）1.0048×100×0.6=100.48×0.6=60.288（千克）答：刷100个油桶需要60.288千克的油漆。祝你开心
(3.14×0.2²×2+0.4×3.14×0.6)×0.6×100
