[其他] {1 空集合}-空集合=?
{1,空集合}-空集合=?
請問這題要怎麼思考阿@@
我對於空集合還不是很了解QQ
請各位大大幫我解答了
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01/23 20:23, , 1F
01/23 20:23, 1F
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01/23 20:28, , 2F
01/23 20:28, 2F
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01/23 20:29, , 3F
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01/23 21:27, , 7F
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01/23 21:55, , 8F
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01/23 21:55, , 9F
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01/02 15:39,
7年前
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07/07 11:50,
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07/07 11:50, 15F