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数学
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(1/2+1/3)+(2/3+1/4)+(3/4=1/5)+(4/5+1/6)+···+(18/19=1/20)+(19/20+1/2)
人气:418 ℃ 时间:2020-06-24 10:17:32
解答
第二项加第三项,第四项加第五项……一直到最后,答案应该是19
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1/1×2×3×4+1/2×3×4×5+1/3×4×5×6+……+1/17×18×19×20
20-19+18-17+16-15+14-13+12-11+10-9+8-7+6-5+4-3+2-1
(1\2+1\3)+(2\3+1\4)+(3\4+1\5)+(4\5+1\6)+.+(18\19+1\20)+(19\20+1\2)
(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)*…*(1-1/19)*(1-1/20)=
1+3+5+7.+17+19/2+4+6+.18+20
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