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國一數學因倍數~
Oct 24th 2013, 16:22

n/14要是最小正因數n=14=2*7上下才可約乾淨

n*n/2^3*3要最小,分子總和最少要有3個2但有2個n相乘所以一個n需2個2才夠約分
到此n=2^2*3*7

n*n*n/2*81=n*n*n/2*3^4,分子要有4個3還有1個2才夠約乾淨,但分子有3個n,故
n=原來的2^2*7再*3^2=28*9=252

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