選擇適當(dāng)?shù)姆椒ū硎鞠铝屑希?br/>二次函數(shù)y=x²-4的函數(shù)值組成的集合
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【解答】{y|y≥-4}
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反比例函數(shù)y=2/x的自變量的值組成的集合
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【解答】{x|x≠0}
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不等式3≥4-2x的解集
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【解答】{x|x≥1/2}
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選用適當(dāng)?shù)姆?hào)填空：
已知集合A={x丨2x-3＜3x},B={x丨x≥2},則有
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-4（∉）B-3(∉ )A{2}(⊆ )BB( ⊆ )A
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2.已知集合A={x丨x²-1=0}則有
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1( ∈ )A{-1}( ⊆ )A ∅( ⊆ )A{1.-1}( = )A
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3.
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{x丨x是菱形}（ ⊆）{x丨x是平行四邊形}
{x丨x是等腰三角形}（⊇ ）{x丨x是等邊三角形}
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6.設(shè)集合A={x丨2≤x＜4},B={x丨3x-7≥8-2x}求AUB A∩B
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【解】
A={x丨2≤x＜4},B={x丨3x-7≥8-2x}={x|x≥3}
∴AUB={x|x≥2}
A∩B={x|3≤x