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
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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