原式 = (1/2 - 1/5)+(1/5 - 1/8)+ (1/8 - 1/11)+(1/11 - 1/14)
可簡化為 1/2 - 1/14 = 6/14 = 3/7
原式 = (1/2 - 1/5)+(1/5 - 1/8)+ (1/8 - 1/11)+(1/11 - 1/14)
可簡化為 1/2 - 1/14 = 6/14 = 3/7
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