• 加法和減法
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  • 哥哥和弟弟合資購買一台電腦,哥哥付4710元, 弟弟付2180元,問該台電腦售多少元?
    4710 + 2180
  • 甲校有學生1068人,乙校比甲校多780人。乙校有學生多少人?
    1068+780
  • 今天展覽入場人次有3785人,上午入場人次有1560人,下午入場人次有多少人?
    3785 - 1560
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