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经典趣味数学题，丁老师用2分钟解答，你呢？
图片：数学题目.png 
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沙发#
发布于：2009-07-12 14:41
7个
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板凳#
发布于：2009-07-14 15:30
3个吧？
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地板#
发布于：2009-07-14 23:05
两个？？？
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4楼#
发布于：2009-07-15 22:18
7个，7个！！
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5楼#
发布于：2009-07-16 14:08
HEHE
 三个吧？？应该是三个 |
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6楼#
发布于：2009-07-16 14:13
7个
1，2，3，4，5，1.5，4.5 |
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7楼#
发布于：2009-07-16 14:14
共8个f（2）f（-2）f（5）f(-5) f(1) f（-1）f（4）f（-4）
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8楼#
发布于：2009-07-16 14:18
1个。
对吗？ |
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9楼#
发布于：2009-07-16 14:18
共4个 f(2) f(1) f(4) f(5)
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