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3-3面積與二階行列式(簡報)

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  • 1. Multiple Choice
    2 minutes
    1 pt

    ΔABC中,AB線段 = 5,AC線段 = 10,向量AB • 向量AC = 48,則ΔABC的面積為?

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    10

    25

  • 2. Multiple Choice
    2 minutes
    1 pt

    設ΔABC的三頂點為A(0,2)、B(4,— 2)、C(a,a— 4),若ΔABC的面積為 12 ,則a = ?(此題兩解)

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    6

  • 3. Multiple Choice
    2 minutes
    1 pt

    已知A(2,—1)、B(—3,2)、C(a + 6,—1—a),若ABC三點共線,試求a值

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