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187.6 X9.9+18.76=18.76X99+18.76=18.76X(99+1)=18.76X100=1876
樓上正解,付第二種解法 6.18X9.9+0.618 =6.18X(10-0.1)+0.618 =61.8-0.618+0.618 =61.8
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