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第一课时《用字母表示数》集体备课PPT课件_1

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用字母表示数
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单击此处编辑母版标题样 式 单击此处编辑母版副标题样式 1 用字母表示数 义务教育课程标准实验教科书小学数学五年级上册 执教 柴占忠 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 你还见过生活中哪些 用字母表示数的例子 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 你还见过生活中哪些 用字母表示数的例子 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 1 阿Q和小D看 阿P的故事 Q D P各表示什么 字母可表示 人名 2 小军和小明同时从A B两 地相向而行 A B 各表示什么 字母可表示 地方 3 扑克牌 黑桃A 梅花k A k各表示什么 字母可表示 数 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 156 367 ax 12 39 14 86510 13 7 1 30 56 56 7849 21 x a 3 找 规 律 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 43 8 2 填 一 填 12n 5 15 n 3 2 4 6 m 10 12 m Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 用字母表示运算定律 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 加法交换换律 文字叙述 用字母表示 两个数相加 交换加数的位置 它们的和不变 a b b a 加法交换律 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 加法结结合律 文字叙述 用字母表示 三个数相加 先把前两个数相加 再把第三个数相加 或者先把 后两个数相加 再同第一个数相 加 它们的和不变 a b c a b c 加法结合律 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 乘法交换换律 文字叙述 用字母表示 简简 写 两个数相乘 交换因数的位置 它们 的积不变 a b b a 乘法交换律 ab ba a b b a 在含有字母的式子里 字母中间的乘号可以记作 也可以省略不写 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 乘法结结合律 文字叙述 用字母表示 简简 写 三个数相乘 先把前两个数相乘 再同 第三个数相乘 或者先把后两个数相乘 再同第一个数相乘 它们的积不变 a b c a b c 乘法结合律 a b c a b c ab c a bc Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 乘法分配律 文字叙述 用字母表示 简简 写 两个数的和同一个数相乘 可以把这两 个数分别同这个数相乘 再把所得的积 加起来 结果不变 a b c a c b c 乘法分配律 a b c a c b c a b c ac bc Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 长长度单单位质质量单单位 为了书写方便 人们常用字母 表示计量单位 面积单位 平方千米 平方米 平方分米 平方厘米 平方毫米 k d c m 吨 千克 克 t kg g 千米 米 分米 厘米 毫米 km m dm cm mm Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 3 字母与字母之间的加号既不能用圆点 代替 也不能省略不写 1 用字母表示简明易记 便于应用 2 字母与字母相乘时 乘号可以用 表示或省略不写 小 结 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 比一比 看谁学得快 一 在含有字母的式子里 乘号可以记作小圆点 也可以省略不写 如 X 2或2 X都可以记作 2 X或2X 但要注意在省略乘号的时候要把数写 在字母的前面 二 1与任何字母相乘时 1可以省略不写 如 1 b 或b 1 都可以记作b 三 字母和字母相乘 中间的乘号也可以记作小 圆点 或省略不写 如a b 记作a b或ab 两 个相同的字母相乘 如b b 可以记作b 读作 b的平方 2 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 努力吧 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 1只手有5个手指 2只手有10个手指 n只手有 个手指 5n Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 省略乘号写出下面各式 b 8 b 1 a 8b 1b a Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 说出下面哪组中的两个式子结果一定相同 6 和 6 2 x x 和 x 2 5 2 5和 2 5 a 2和 a 相同 相同 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 省略乘号 写出下面各式 4 b x 5 a c 1 x x x 4b 5 x ac x x 2 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 根据运算定律在 里填上适当的数或字母 a 2 c a b 4 3 5 a2c 4ab 3 5 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 数和字母相 乘 在省略 乘号时 要 把数字写在 字母的前面 字母和字母相 乘时 乘号可 以省略不写 或用 表 示 1 a 2 2 a 2 a 2a 2 a b a b a b 3 数与数相乘时用 号 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 4 和式中出现单位需加括号 5 字母与字母相乘时一般按英文 字母顺序 6 当1与字母相乘时1省略不写 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 你知道最早有意识地系统使用 字母来表示数的人是谁吗 他就 是法国数学家韦达 韦达一生致 力于对数学的研究 做出了很多 重要贡献 成为那个时代最伟大的数学家 自从韦达系统使用字母表示数后 引出了 大量的数学发现 解决了很多古代的复杂 问题 Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial Five weeks of practice ended in this way and my feelings can only be summed up in eight words although hard but very substantial 2012年10月23日 单击此处编辑母版标题样 式 单击此处编辑母版副标题样式 29 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