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Mathematics

8th

grade

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2上 4-2 配方法與公式解

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10 questions

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  • 1. Multiple Choice
    1 minute
    1 pt

    解方程式2x2+5x-9=0,則x=?

  • 2. Multiple Choice
    1 minute
    1 pt

    下列哪一個二次方程式的兩個解相等(重根)?

    x2-10x-25=0

    x2+10x+25=0

    -9x2+12x-4=0

    9x2-12x-4=0

  • 3. Multiple Choice
    1 minute
    1 pt

    ab為方程式2+3xx2=0的解,則ab的值為多少?

    3

    -3

    2

    -2

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