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估算的,可以把38看成40,16看成15,然後40+15=55 18可以看成20,21看成20,27看成30,然後20+20+30=70 那98_這個是什麼意思,是减吧?如果是那就 98可以看成100,51看成50,16看成15,然後再100-50+15=65 僅供參考
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