為什麼國中考試有這題呢？
>> >>>>已知:
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>> >>>>媽媽比小孩大 21 歲,
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>> >>>>六年之後
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>> >>>>媽媽的年齡是小孩年齡的 5 倍
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>> >>>>請問:
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>> >>>>爸爸現在在哪裡?
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>> >>>>不要這麼快看解答嘛~~~~~~~
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>> >>>>計算一下
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>> >>>>參考解答:
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>> >>>>設
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>> >>>>媽 M 歲，
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>> >>>>小孩 C 歲
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>> >>>>M = C + 21
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>> >>>>M + 6 = ( C + 6 ) * 5
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>> >>>>解聯立:
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>> >>>>C = -3/4
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>> >>>>也就是說
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>> >>>>小孩子在九個月之後會出生
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>> >>>>所以
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>> >>>>爸爸現在在媽媽上面~~~~~^^