第9课小海龟写字算数课件小学信息技术甘教课标版六年级上册课件

小结
用计算输出命令（PR）时，应注意： ① 根据输出内容，灵活运用三种格式。
② 输出多项内容时，不要忘记整个命令 外面的圆括号。
例1：
请小海龟计算下列式子，写出相应的命令。
（1）2＋3－1 （2）4×5 （3）6÷(2＋1) （4）28×76÷22－12
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
例3：
请小海龟帮忙计算圆的周长，这个圆的 半径是50海龟步，写出完整的LOGO命令。 （圆的周长＝2×3.14×圆的半径）
答案： PR 2*3.14*50
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
一、小海龟写字
• 格式： TT [文字]
功能：直接显示方括号 里的文字。
? TT [见到你很高兴] 见到你很高兴
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
例4：
在命令窗口输出“你真聪明！”这 句话，写出完整的LOGO命令。
答案：PR [你真聪明！]
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
聪明的小海龟
——小海龟写字、算数
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
当堂训练
1. 用LOGO命令算出下列算式的结果。 （1）3.14×45×45 （2）11×22＋444÷333
2. 试在命令窗口中输出你的班级和姓名， 要求输出结果的格式是：我是×年级×班 的×××。
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
这节课我们来 学习LOGO命 令的写字和计 算本领。
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
例1答案
? PR 2+3-1 4 ? PR 4*5 20 ? PR 6/(2+1) 2 ? PR 28*76/22-12 84.73 ?
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
（二）计算输出命令
格式2：PR [输出内容]
? PR [4] 4
空格
字或句子或算 ? PR [2+3]
式或符号等
2+3 ? PR [A]
功能：原样显示输出内容。 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."
二、小海龟做算术
（一）计算输出命令
格式1：PR
空格
A
数字或者算式
功能：如ቤተ መጻሕፍቲ ባይዱA是数字，直接显 示A；如果A是算式，显 示A的结果。
? PR 4 4 ? PR 2+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."
例2：运行下列命令，写出运 行结果。
（1）PR [12+1] （2）PR 12+1 （3）(PR [12+1=] 12+1)
? PR [12+1] 12+1 ? PR 12+1 13 ?（PR [12+1=]
12+1） 12+1=13
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."
（三）计算输出命令
格式3：（PR 内容1 内容2 …… ）
空格
功能：显示多个输出内容。如果，内容 外有方括号，则原样显示输出内 容；若内容外没有方括号，则显 示结果。
Five weeks of practice ended in this way, and my feelings can only be summed up in eight words, "although hard, but very substantial."