減法
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把答案相同的算式連起來
Great job!!!
教室裡本來有23個小朋友,有9個出去跑出去上廁所,現在教室裡剩下幾個小朋友?
23-9=14
你本來有18元,媽媽再給你20元,請問你現在有多少錢?
18+20=38
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