密度、浮力、杠杆综合类题目对初中学生来说难度较大 ,为了帮助同学们迅速解答这一类综合题 ,我归纳总结出了简单易懂的口诀 :杠杆、浮力综合题左右平衡挂固体浸没于液体再分析条件合适用规律 (ρ固 ρ液)同固、同液、同高低密度不同看仔细固 (体 )大密 (度的一端 ) ,液 (体 ) The topics of density, buoyancy and leverage are more difficult for junior high school students. In order to help the students quickly answer this type of comprehensive question, I have summarized the simple and easy-to-understand words: Levers, buoyancy problems, left and right balance, solid immersion For the liquid reanalysis conditions, use the law (ρ solid ρ liquid) in the same way as the solid, the same liquid, and the same height and density to see carefully the solid (body) large density (one end of the degree), liquid (body)