B3U1 Reading 1-2
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B3U1 Reading 1-9
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B3U1 Reading 1-3
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B3U1 Reading 1-10
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已知U={0,1,2},A={|a-2|,2},A⊆U,则a的值为() A: -3或1 B: 2或1 C: 1或2或3 D: 1
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$u$, $v\in E^3$, $u=(0,-1,1),v=(1,-1,-1)$. What is $||u \times v||^2$:<br/>______