趣味英语（2）

vivian

        三、数学推理题

        能力竞赛题中常常会出现数学知识（或叫数学推理）题，解题时需要运用到一定的数学知识。命题形式可能是图表形式，也可能是提问形式。如：How many minutes is it before 12 noon, if 48 minutes ago it was twice as many minutes past 9 a.m.?（2006NEPCS高二组初赛题） 这是一道难度不小的数学推理题，答案为：44 minutes. 因为12点整的44分钟前为11:16，而11:16的48分钟前为10:28；9:00 + (44 × 2) = 10:28. 有时还要运用到几何或代数知识，如：Find the ages of Mary, George, Alice, Claire and Stephen if the sum of the ages of two of them all as follows：Mary + George = 33 years; Alice + Claire= 95 years; Stephen + Mary = 72 years; Mary+ Claire= 87 years; Stephen + George = 73 years. 此题可用代数法求出答案，即分别用5个字母代替题中的5个人写出等式：A + B = 33; C + D = 95; E + A = 72; A + D = 87; E + B = 73可以求得：A = 16；B = 17；C = 24；D = 71；E = 56。

zhjpf2008

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