考考你 27+9÷3 ① 48 6X6 ① 20 X（5+4） ① 240÷6×3 讲故事 新知探究 语文课上学生轮流“讲故事”，淘气选了一个850 字的故事。 淘气3分能讲多少字？ 讲的总字数 ÷ 讲的总时间 每分钟能讲的字数 × 3 3分钟能讲的字数 新知探究 语文课上学生轮流“讲故事”，淘气选了一个850 字的故事。 淘气3分能讲多少字？ 850÷5×3 ① ② =170×3 =510（字） 答：淘气3分能讲510字。 新知探究 笑笑讲一个故事用了4分，平均每分讲150字。如果 要3分完成，每份应讲多少字？ 平均每分钟的字数 × 讲的总时间 讲的总字数 ÷ 3 每分钟讲的字数 新知探究 笑笑讲一个故事用了4分，平均每分讲150字。如果 要3分完成，每分应讲多少字？ 150×4÷3 ① ② =600÷3 =200（字） 答：每分应讲200字。 课堂小结 你知道乘除混合算式的运算是按什么顺序吗？ 850÷5×3 ① ② 150×4÷3 ① ② =170×3 =510（字） =600÷3 =200（字） 乘除混合算式的运算顺序： 按照从左到右的顺序计算。 巩固练习 练一练 3. 279÷3÷3 =93÷3 735÷5÷7 =147÷7 =31 960÷6×4 =160×4 =640 =21 800÷（2×4） =800÷8 =80 巩固练习 练一练 4. 120÷5×9 =24×9 =216（元） 答：买9辆这样的玩具 车需要216元。 8×6÷4 =48÷4 =12（人） 答：如果排成4排，每排 12人。 课堂小结 乘除混合算式的运算顺序： 按照从左到右的顺序计算。 团Tiffany，a 16yearold girl ，was very shy.Last September ，her best friend，Sophie，moved abroad with her family because she had to continue her studies in America.She even said she would not come back for at least a few years. 1 “I was really sad the moment I heard the bad news and I didnt know what to do，” Tiffany recalled.“I shut myself in my room for a whole week.It was then that my aunt took me to a sports club one Saturday and I saw so many young people playing different kinds of sports there.I signed up for a beginners course in volleyball and since then I have been playing this sport.Now I practice twice a week there.It is wonderful playing sports in this club and I have made lots of friends as well. 2 ” The most basic aim of playing sports is that you can improve your health even if you are not very good at sports.Besides ，you can get to know a circle of people at your age while playing sports. 3 Since she joined the sports club，she has opened up herself and now she has become very active and enjoys meeting and talking with others. 1．Its polite for girls to kiss each other on the side of the face. 4．Its no big deal.For most people，that is one of the reasons why they join a sports club. 4 You dont have to sit down and talk to strangers.You go in for sports and it is easier to understand your partners on the same team.Now Tiffany is quite popular with her friends and she has also become more confident.团圆圆一家在台湾可受 欢迎了 。每天 ，小朋 友们排 着长队 ，等着 跟它们 合影留 念。从 “排着 长队” 体现出 每天喜 欢它们 的人不 计其数 ，特别 受欢迎 。从“ 合影留 念”体 现出大 家都想 和大熊 猫留住 最美丽 的瞬间 以作纪 念。N othing can be accomplished without norms or standards. 感谢阅读！祝你生活愉快， 身体健康
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