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Mathematics

7th

grade

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1上 1-2 整數的加減

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10 questions

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  • 1. Multiple Choice
    1 minute
    1 pt

    算式(-35)-[(-2+17)-(-15)]的值為多少?

    -5

    -35

    -39

    -65

  • 2. Multiple Choice
    1 minute
    1 pt

    下列四式中,何者不能成立?

    (11+7)-4=11+(7-4)

    (70-35)-25=70-(35+25)

    (-80)-(-30)=(-30)-(-80)

    (-25)+[-(-13)]=[-(-13)]+(-25)

  • 3. Multiple Choice
    1 minute
    1 pt

    a>0,b<0,且|a|<|b|,則ab=?

    -(|b|-|a|)

    -(|a|+|b|)

    +(|a|+|b|)

    +(|b|-|a|)

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