已知集合a={x1 X的2次方=1x∈r},b={x1x≥a},若a是b的真子集,a范围 知乎 Template




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tomski已知集合a={x1 x的2次方=1x∈r},b={x1x≥a},若a是b的真子集,a范围 知乎 coloring