Mathematics, 14.06.2021 06:10, seanisom7

Trong không gian R2, cho tích vô hướng (x, y)=((x1;x2),(y1;y2))=x1y1−x1y2−x2y1 +3x2y2. Tính độ dài của véctơ v=(−1;3)

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Trong không gian R2, cho tích vô hướng (x, y)=((x1;x2),(y1;y2))=x1y1−x1y2−x2y1 +3x2y2. Tính độ dài c...