In a small village, a little boy lived with his father and mother. He was the only son for them. The parents of the little boy were very sad because of his bad temper(脾氣) . The boy used to get angry v
These one-month-old little tigers have met visitors for the first time at a zoo in southwest China. “The mother was quite weak after giving birth to three little tigers. She does not have enough milk
一、教材分析 1.教材内容:《相似三角形的性质与判定》是以北师大版义务教育八年级下册第四章的知识为背景建构的教学内容,通过复习讲解相似三角形的性质与判定,利用相似三角形的性质与判定相关的知识去解一些数学问题。 2.教材的地位和作用:本节课是在学完《相似三角形》、《探索三角形相似的条件》内容之后,继续学习相似多边形的性质的准备。教学的内容培养学生观察思考,从定义出发和举一反三的能力等都具有重要的