0 bình luận về “chứng tỏ rằng 1+1/2+1/3+1/4+…+1/31+1/32>7/2”
1+1/2+1/3+1/4+1/5+….+1/31+1/32 =(1+1/2+1/3+1/4+1/5+1/6)+(1/7+1/8+..+1/12)+(1/13+1/14+..+1/18)+(1/19+1/20+..+1/24)+(1/25+1/26+1/27+1/28)+(1/29+1/30+1/31+1/32) lớn hơn (1+1/2+1/3+1/4+1/5+1/6)+(1/12+1/12+..+1/12)+(1/18+1/18+..+1/18)+(1/24+1/24+..+1/24)+(1/28+1/28+1/28+1/28)+(1/32+1/32+1/32+1/32)
=49/20+6/12+6/18+6/24+4/28+4/32=3193/840 lớn hơn 7/2
1+1/2+1/3+1/4+1/5+….+1/31+1/32 =(1+1/2+1/3+1/4+1/5+1/6)+(1/7+1/8+..+1/12)+(1/13+1/14+..+1/18)+(1/19+1/20+..+1/24)+(1/25+1/26+1/27+1/28)+(1/29+1/30+1/31+1/32) lớn hơn (1+1/2+1/3+1/4+1/5+1/6)+(1/12+1/12+..+1/12)+(1/18+1/18+..+1/18)+(1/24+1/24+..+1/24)+(1/28+1/28+1/28+1/28)+(1/32+1/32+1/32+1/32)
=49/20+6/12+6/18+6/24+4/28+4/32=3193/840 lớn hơn 7/2
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