初中学函数时,为什么不直接说明“x的取值范围”称为“定义域”,“y的取值范围”称为“值域”? 知乎 Template




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tomski初中学函数时,为什么不直接说明“x的取值范围”称为“定义域”,“y的取值范围”称为“值域”? 知乎 coloring