将1/5+1/6+1/7+1/8......+1/17的计算结果化成小数后,它的整数部分是多少?答案是20
答案是 1 .5*(1/9) < A = (1/5+1/6.....+1/9) < 5*(1/5)8*(1/17) < B = (1/10+1/11+....1/17) < 8*(1/10)1 < 5*(1/9)+8*(1/17) < S = A+B < 5*(1/5) + 8*(1/10) < 2
20
为0