1.已知a(向量a)=(1,1),b(向量b)=(-4,5),分别求a(向量a),b(向量b)的单位向量a0和b02.用向量法证明:对角线相等的平行四边形是长方形.3.用向量法证明:平行四边形两条对角线长度的
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![1.已知a(向量a)=(1,1),b(向量b)=(-4,5),分别求a(向量a),b(向量b)的单位向量a0和b02.用向量法证明:对角线相等的平行四边形是长方形.3.用向量法证明:平行四边形两条对角线长度的](/uploads/image/z/5503010-50-0.jpg?t=1.%E5%B7%B2%E7%9F%A5a%EF%BC%88%E5%90%91%E9%87%8Fa%EF%BC%89%3D%EF%BC%881%2C1%EF%BC%89%2Cb%EF%BC%88%E5%90%91%E9%87%8Fb%EF%BC%89%3D%EF%BC%88-4%2C5%EF%BC%89%2C%E5%88%86%E5%88%AB%E6%B1%82a%EF%BC%88%E5%90%91%E9%87%8Fa%EF%BC%89%2Cb%EF%BC%88%E5%90%91%E9%87%8Fb%EF%BC%89%E7%9A%84%E5%8D%95%E4%BD%8D%E5%90%91%E9%87%8Fa0%E5%92%8Cb02.%E7%94%A8%E5%90%91%E9%87%8F%E6%B3%95%E8%AF%81%E6%98%8E%EF%BC%9A%E5%AF%B9%E8%A7%92%E7%BA%BF%E7%9B%B8%E7%AD%89%E7%9A%84%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E6%98%AF%E9%95%BF%E6%96%B9%E5%BD%A2.3.%E7%94%A8%E5%90%91%E9%87%8F%E6%B3%95%E8%AF%81%E6%98%8E%EF%BC%9A%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E4%B8%A4%E6%9D%A1%E5%AF%B9%E8%A7%92%E7%BA%BF%E9%95%BF%E5%BA%A6%E7%9A%84)
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