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你知道怎么用1根火柴托起11根火柴吗?不 …
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请在图中加上1根火柴棒,使两边的式子成立 …
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有6根火柴棒,排成2个等边三角形。现在, …
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当你下次参加派对时,就可以用这个“ 巨蛋 …
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给你4根火柴,在4个玻璃敞口杯上搭一座桥 …
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