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12 条相同的短线段，步长 100 。

体验. 想一想. 12 条相同的短线段，步长 100 。. 1 条长线段步长为 150. 体验. 想一想. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. 120. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3. FD 100 BK 100 RT 3.

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12 条相同的短线段，步长 100 。

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  1. 体验 想一想 12条相同的短线段，步长100。 1条长线段步长为150.

  2. 体验 想一想 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 120 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 …… 120条相同的短线段，步长100。 FD 100 BK 100 RT 3 BK 150 HT 1条长线段步长为150.

  3. 探索 认识REPEAT 请同学们自学课本第13-14页，然后同桌之间说一说、再试着做一做。 花朵120瓣 花朵步长100 花茎步长150

  4. 探索 认识REPEAT 思考并讨论： REPEAT命令使用格式分为几个部分？分别表示什么意思？

  5. 讨论 找一找 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 120 FD 100 BK 100 RT 3 120 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 …… FD 100 BK 100 RT 3 BK 150 HT [FD 100 BK 100 RT 3] 120 REPEAT 120 [FD 100 BK 100 RT 3] BK 150 HT

  6. 观察 说一说 FD 60 BK 60 RT 45 重复的命令是： 8 8 重复的次数是： 8 FD 100 BK 100 RT 45 REPEAT [] BK 120 HT FD 100 BK 100 RT 6 重复的命令是： 60 60 重复的次数是： FD 100 BK 100 RT 6 60 REPEAT [] 短线段步长100。 BK 150 HT 长线段步长为150.

  7. 实践 画一画 画出你心目中的蒲公英

  8. 观察 FD 100 BK 100 RT 3 比一比 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 REPEAT 120 [FD 100 BK 100 RT 3] BK 150 HT FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 120 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 FD 100 BK 100 RT 3 …… FD 100 BK 100 RT 3 BK 150 HT

  9. 实践 做一做 选择下面的一个图形，用REPEAT命令画出来。

  10. 小结 说一说，本节课你有哪些收获。

  11. 敬请指导！

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