简算:1/2+1/6+1/12+1/20+……+1/110 (“/”这是分数线)急
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![简算:1/2+1/6+1/12+1/20+……+1/110 (“/”这是分数线)急](/uploads/image/z/1031172-60-2.jpg?t=%E7%AE%80%E7%AE%97%EF%BC%9A1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B%E2%80%A6%E2%80%A6%2B1%2F110+%EF%BC%88%E2%80%9C%2F%E2%80%9D%E8%BF%99%E6%98%AF%E5%88%86%E6%95%B0%E7%BA%BF%EF%BC%89%E6%80%A5)
简算:1/2+1/6+1/12+1/20+……+1/110 (“/”这是分数线)急
简算:1/2+1/6+1/12+1/20+……+1/110 (“/”这是分数线)
急
简算:1/2+1/6+1/12+1/20+……+1/110 (“/”这是分数线)急
原式=1-1/2+1/2-1/3+1/3-1/4+……+1/10-1/11=10/11
这个式子很重要,这叫拆项法,学数列经常用
1/2+1/6+1/12+1/20(简算)
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
1/2+1/6+1/12+1/20+1/30.+1/9900(简算)
1/2+1/6+1/12+1/20+.+1/72+1/90简算
1/2+1/6+1/12+1/20+…+1/72+1/90简算
帮忙想个题:简算:1/2+1/6+1/12+1/20+.+1/110=?
1/2+1/6+1/12+1/20+1/30=?简算
简算:1/2+1/6+1/12+1/20+……+1/380
1/2+1/6+1/12+1/20+1/30=?简算
简算:1/2+1/6+1/12+1/20+1/30/就是分数线,
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简算
1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56=?简算,快
2分之1+6分之1+12分之1+20分之1+30分之1+…+9900分之1简算
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=?简算
简算:1/6+1/12+1/20+1/30+.1/72+1/90