Question

6/5-12/7+12/7+20/9-30/11+……+18+19/18×19-19+20/19×20这道题怎么做要简算

Answer 1

题目抄得比较乱,前面的分数都写反了.应该是：5/6 -7/12 +9/20 -11/30+...+(18+19)/(18×19)-(19+20)/(19×20)5/6 -7/12 +9/20 -11/30+...+(18+19)/(18×19)-(19+20)/(19×20)=(2+3)/(2×3)-(3+4)/(3×4)+(4+5)/(4×5...