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第一章 答案
1.小明应该先涂d。根据比赛规则,如果小明先涂d,那么无论小强涂哪一块(ɑ或g),小明还是有地方可涂。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0048_0001.jpg?sign=1739114378-REZruwa7HgvIbJTaqrh2QgoOtIu6ogDS-0-b7ac7d2c1f521c7970722c303c229b2a)
2.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0048_0002.jpg?sign=1739114378-kVQqFlfHyeuT0SZNMCY9ReTk1JOc3KRz-0-71bcfc898c0d5fee9ff38446c05e209f)
3.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0048_0003.jpg?sign=1739114378-ye12qpgTxRFnFIs2WafFGb4erZJA4VPO-0-ed5a5ff2ef06d3a4f76c0d8805210e66)
4.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0048_0004.jpg?sign=1739114378-xwznvanHFsvnvI8lzckV9EkWqmLG9CkO-0-fc94bd2d635c858681757a3206da93fe)
5.按下图的路线走最好。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0048_0005.jpg?sign=1739114378-ievw64EtDTf5tEtbWRVtvbFvwlV5sJHz-0-3373323d9db0184d12adb9191207d7be)
6.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0048_0006.jpg?sign=1739114378-pTrYr3ZvBIjsxm9yLjTcT7KbXZAPXgnN-0-92a98279cc8a25ecbfd06e84dadb5e9d)
7.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0049_0001.jpg?sign=1739114378-KPAe14zQbSabih37pgd8GIeatYOAcNZF-0-e7892413f3f97f0b10d989a4bf10d52d)
8.土地如图所示,这样划分后面积就只有5000平方米。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0049_0002.jpg?sign=1739114378-TeDH1UKGb3mDsLyNiDR11nR7pjgxUNEJ-0-afccca9ffb15915ef9186c94f5d2e6fe)
9.如图所示,一共能连出11个正方形。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0049_0003.jpg?sign=1739114378-qfYMY8W6skFutBNIXugvZo1Xr5SXh98N-0-d573e12634981ca2f4cdeef0a5ac45e7)
10.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0049_0004.jpg?sign=1739114378-AKpAC24LyNzNymNfsp0eHRovDwPvL3DX-0-afba3b4c30d9c56fdc94dd87cff18138)
11.是3。图中的圆点部分表示时钟的分针和时针所指的位置。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0049_0005.jpg?sign=1739114378-Q30kSL4XfzJo3MQxe2Hh2atud6cNGUj7-0-7a6c61af82b90c3e59c1d7b56070e2a3)
12.①把两边的两端分别用胶水粘起来;②用剪刀沿虚线剪开;③打开便是一个长方形。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0049_0006.jpg?sign=1739114378-7LneMAVbqdJVeKOsJBm3CBai3DNcmBl0-0-8bc429bd7dea7c47c816a2d27466df5d)
13.①将方格内数字为“0”的四周打上“×”。
②以“A”格为例,在原题中“A”格处为“1”,且“A”格旁只有1个方格没有打“×”,所以这格中有地雷。
以此类推就可以判断出所有地雷的位置。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0050_0001.jpg?sign=1739114378-EypJShoFOwJU007Z1T1erlq5FQ1ppT9D-0-f3777936abe6d5f16f338531717d39ce)
14.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0050_0002.jpg?sign=1739114378-VTNZkVN9YeUjz7TsH1Fz0ikz9jPJv6xs-0-8c15d874289e2056331cf09f72d1ba89)
15.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0050_0003.jpg?sign=1739114378-FHvO4vb9Z3cuKCA246AKktGtu2mH3Pqg-0-ceff65bcc331857d815ccb711324bc50)
16.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0050_0004.jpg?sign=1739114378-8LiWoqJBqHshmFahAQamOIzFqzGiRcKz-0-65af5d92588c641e8641f5a4ceaa1fa9)
17.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0050_0005.jpg?sign=1739114378-MAPjy4ARgfSgfHhCCMnufeLvrJ7sXzpW-0-31a100fd9488daec2f550cf60ec7e2f2)
18.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0051_0001.jpg?sign=1739114378-lQI7hM6EhIF5S1n0I7xJnDFyRUqPO7DG-0-b6ef843f17fdfa5f4d49b6cf2fdb12ae)
19.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0051_0002.jpg?sign=1739114378-cXHeEPkJA7FccoCi9nvLiLvKCzFSSesF-0-bc6ed0acc91c921dc3faa42468f1cdd2)
20.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0051_0003.jpg?sign=1739114378-abbbRcjFWOVS5bqsEQO7Tt1QVzjgko0D-0-4bd953e8085ee15904892dbce7bfb439)
21.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0051_0004.jpg?sign=1739114378-RHpWRy23z0IZ0o76axnrzvEcHmdkdhPY-0-dc87bc38b3a0186e2b88d49b04df6205)
22.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0051_0005.jpg?sign=1739114378-bHdWlKQtbyQbEVabjChsbvNPaNZ53hai-0-a043f1300266bcff3e9faf7aa6721cb3)
23.题目的限制条件是“用4条直线”,思考答案时要跳出正方形的局限,向无限的可能延伸。正确答案如下图所示:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0051_0006.jpg?sign=1739114378-8wDNSymNyfOD2qsxrv3GqPEbDmKMrD09-0-a5128a76da1a7c1f7eee457950c359d4)
24.如图所示,把软管的两端对接,向相反方向移动3颗白珠子,然后松开接口,取出有色珠子。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0052_0001.jpg?sign=1739114378-eCSvwgtaQALtUJZOtW91vGQotnEUFYVC-0-18e3515c2698cd88606d85670e10f276)
25.D。这3个正方形重叠后出现了4个三角形。如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0052_0002.jpg?sign=1739114378-ybRVbt7FBLHRVxvOAOgZE6pVKLn53Vi5-0-23cbd289f0bf02578354113d7c82679c)
26.如下图,变成了“小石”。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0052_0003.jpg?sign=1739114378-UmSZKxIVtjZUForu0KuTiNMwFaXVmf01-0-7dd8a346ed9738d8dad157d4a7b589fb)
27.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0052_0004.jpg?sign=1739114378-V2hqrT5ct3EyKoAHwEP6A7mPPfi3GbQL-0-ec05a60fe96f2ec6cd27bf56c90d3a93)
28.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0052_0005.jpg?sign=1739114378-yeZgwC5KhyeylftNMescWvElni6jAc5A-0-a4bf23d31a4e7f95c26013cad0dd45f8)
29.2。在两组图形中,每组里的图形都包含一个共同出现的箭头。
30.下图是其中一种解决方案。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0052_0006.jpg?sign=1739114378-Gh0Xy44RNnHUVgZyHTxWIxN2YdFmXUQB-0-0dc8b06dc4237531de7b10a152ff01a9)
31.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0053_0001.jpg?sign=1739114378-Gr592daw0nTIa4moG2E2CMrTYoly2IPO-0-b0b445b91a86bd1fe7e4c58559c852a9)
32.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0053_0002.jpg?sign=1739114378-PH8Kflw5fhORNlgtNFIZpEY3hFVtqk5f-0-3f76f4a1c572325b494bcc6ee8022112)
33.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0053_0003.jpg?sign=1739114378-1pSp012g8NNV1McNNtHS4k1MnNMgsq9u-0-865a490a4bf1c0181461610fea808376)
34.A。那3个六边形中每个都有6个三角形,且每个三角形都有一条边和六边形的一条边重合。三角形的高依次增加,且每次增加六边形高的1/4。以一个三角形为例,如下图所示:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0053_0004.jpg?sign=1739114378-dWGuerqi3yDxH7JWONL5O6uuidjH1zsd-0-1ef0fd0f817fec947b648c1c58a5d8fb)
35.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0053_0005.jpg?sign=1739114378-3sNbCSejc6HgrJeME1XOf3eE9SL2K9ZA-0-c1c00896d3e22e811f513d84f6f5ff1c)
36.像下图那样画一条线就得到5个水杯了。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0053_0006.jpg?sign=1739114378-bjUjSiMyU5cd6eZuBQkqNMXwUFcYYtgC-0-1baaddbf8d516c3067a318343452746c)
37.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0054_0001.jpg?sign=1739114378-pCIRG4NLuJ3nv9AAAQKs6nO9XocLc9xY-0-849d3950758a10d9647c762f088b0775)
38.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0054_0002.jpg?sign=1739114378-4QQTcugMHxtfdJQPlSFyJxNfp0AwTFms-0-961ad409e20a78afa7ff06ad1c5d3202)
39.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0054_0003.jpg?sign=1739114378-2tEgxtB0WfjwphcauyJz4AKwGk8uVFQn-0-f79e4ad7b8a3813ce4e6f2d1a9f49c37)
40.能。方法如下图。窍门是把左半部分上下颠倒,与右半部分连接。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0054_0004.jpg?sign=1739114378-THWKDEHJ6PZQEQHFSgnbPRkXijiDVune-0-f65960389b9d383689abb2cb552e5cb6)
41.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0054_0005.jpg?sign=1739114378-6YDZjshsNfXzfweIEWWPuIf06v9ya60I-0-0d0362008880284ab4e4b0aa7c9778e6)
42.摆法并不唯一,下图是其中一种摆法。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0054_0006.jpg?sign=1739114378-382i9k9qy8OVwCmpMYsWlTo4gL79PNBf-0-702c1f42860faef837fee821343f0937)
43.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0055_0001.jpg?sign=1739114378-ge0UCp7F0b4rfLBsSgE0LmRte3lGlOhb-0-efb364bf0028f0de651206df2129a50e)
44.2株。倘若水池是圆形的,如图所示,则仅需2株即可满足上述条件。池的形状为此问题中刻意隐藏的条件。
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0055_0002.jpg?sign=1739114378-9bMiogbmKKaou6SrpVB29NEGKqGFGOi4-0-631488f2b24b7e2ecb65b5d0aec0d7bc)
45.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0055_0003.jpg?sign=1739114378-TqIBk6vJih1s6uEwjQqPGxPBUPwl2anC-0-56d1ca7adae3a301867b0f8734bb0e29)
46.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0055_0004.jpg?sign=1739114378-MVUSdEtEmppP85U3vlhLpHqQHGZ83dO8-0-73b8725d7513b84c2deaf64f0ca8e41a)
47.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0055_0005.jpg?sign=1739114378-IumPPmB03Xmp92Mrc5pHRNdoPe2er3k3-0-1f36e4d50556f3a8ac038d5a9a9ae8dd)
48.如图:
![](https://epubservercos.yuewen.com/B3FF73/12291966703965606/epubprivate/OEBPS/Images/figure_0055_0006.jpg?sign=1739114378-p6960Ao7Wi5kLHjWLndUHirRIZqYkpyb-0-ab72fd250b47280997bead2bbb736b25)