九年级数学上册-1-4-用一元二次方程解决问题学案(新版)苏科版VIP免费

ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.用一元二次方程解决问题学习目标1. 会根据具体问题中的数量关系列出一元二次方程并求解，能检验所求的问题的结果是否符合实际意义；2．体会一元二次方程是刻画现实世界数量关系的有效数学模型。学习重点利用一元二次方程解决实际问题。学习难点根据实际问题找等量关系，列出一元二次方程。一、课前预习：1．生物兴趣小组的学生，将自己收集的标本向本组其他成员各赠送一件，全组互赠了 182 件。求全组人数。2．如图所示，人民海关缉私巡逻艇在东海海域执行巡逻任务时，发现在其所处的位置 O 点的正北方向 10 海 里外的 A 点有一涉嫌走私船只正以 24 海里/时的速度向正东方向航行，为迅速实施检查，巡逻艇调整好航向，以 26 海里/时的速度追赶。在涉嫌船只不改变航向和航速的前提下，问需要几小时才能追上（点 B 为追上时的位置）？【例题教学】例 1：某商场购进一批单价为 50 元的商品，规定销售时单价 不低于进价，其批注/记录Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the league members. All League branches should start with recommending outstanding students as the development objects of the League, take amateur league schools as the basis, conscientiously do a good job in the work of pre-league education, league membership education, League members' vanguard exemplary consciousness education, excellent leagu...