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根據題中所給出的八個數位,可以這樣思考:先把這八個數加起來得360,而要求每個大圈上五個數的和等於210,那麼兩個大圈的和是420,其中共用的兩個小圈裏的數的和就應是420-360=60.這就有如下的可能,一是10和50.二是40和20.這樣就能很快找出答案
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