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标题: [讨论]天山9-36 [打印本页]

作者: equilibrium    时间: 2005-5-25 06:12     标题: [讨论]天山9-36

M is the least common multiple of 90,196,300. which is not the factor of M?

A, 600 B 700 C 2100 D 900 E 4900

ans: A but why


作者: asasasas1    时间: 2005-5-25 06:16

答案是A

因為 90=2*3^2*5

196=2^2*7^2

300=2^2*3^5^2

600=2^3*3*5^2

M 沒有2^3的factor 所以答案是A






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