用适当的方法表示下列集合: (1)由小于6的所有自然数组成的集合 (2)由大于3的全体实数组成的集合 (3)由一次函数 y=2x+3图像上所有的点组成的集合 (4)构成英语单词ma t hema t i c s(数学)的字母组成的集合 (5)方程 的
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举一反三
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