分数1/1•2•3+1/2•3•4.1/9•10•11•是乘号\是分数线
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![分数1/1•2•3+1/2•3•4.1/9•10•11•是乘号\是分数线](/uploads/image/z/12634423-7-3.jpg?t=%E5%88%86%E6%95%B01%2F1%26%238226%3B2%26%238226%3B3%2B1%2F2%26%238226%3B3%26%238226%3B4.1%2F9%26%238226%3B10%26%238226%3B11%26%238226%3B%E6%98%AF%E4%B9%98%E5%8F%B7%5C%E6%98%AF%E5%88%86%E6%95%B0%E7%BA%BF)
分数1/1•2•3+1/2•3•4.1/9•10•11•是乘号\是分数线
分数1/1•2•3+1/2•3•4.1/9•10•11
•是乘号
\是分数线
分数1/1•2•3+1/2•3•4.1/9•10•11•是乘号\是分数线
原式=(1/2)*(1/1*2-1/2*3)+(1/2)*(1/2*3-1/3*4)+……+(1/2)*(1/9*10-1/10*11)
=(1/2)*(1/1*2-1/2*3+1/2*3-1/3*4+……+1/9*10-1/10*11)
=(1/2)*(1/1*2-1/10*11)
=27/110