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|a|=|b|=1 a•;b+b•;b=3/2 所以a•;b=3/2-|b|²;=1/2 所以|a|*|b|*cosθ=1/2 所以1*1*cosθ=1/2 即cosθ=1/2 所以向量a與向量b的夾角為(60°) 如果不懂,祝學習愉快!
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