神马作文网2/3+2/15+2/35+2/63+2/99+2/132
来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/11/20 10:52:22
2/3+2/15+2/35+2/63+2/99+2/132
原式=2/(1x3)+2/(3x5)+2/(5x7)+2/(7x9)+2/(9x11)+2/(11x12)
=(3-1)/(1x3)+(5-3)/(3x5)+(7-5)/(5x7)+(9-7)/(7x9)+(11-9)/(9x11)+2/(11x12)
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+2/(11x12)
=1+(1/3-1/3)+(1/5-1/5)+(1/7-1/7)+(1/9-1/9)-1/11+2/(11x12)
=10/11+2/(11x12)
=(120+2)/(11x12)
=61/66.
=(3-1)/(1x3)+(5-3)/(3x5)+(7-5)/(5x7)+(9-7)/(7x9)+(11-9)/(9x11)+2/(11x12)
=(1-1/3)+(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+(1/9-1/11)+2/(11x12)
=1+(1/3-1/3)+(1/5-1/5)+(1/7-1/7)+(1/9-1/9)-1/11+2/(11x12)
=10/11+2/(11x12)
=(120+2)/(11x12)
=61/66.
2/3+2/15+2/35+2/63+2/99+2/132
3/2+15/2+35/2+63/2+99/2+132/2的简便算法
2/3+2/15+2/35+2/63+2/99
2/15+2/35+2/63+2/99+2/143
简便计算：3/2+15/2+35/2+63/2+99/2+143/2
简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
2/3+2/15+2/35+2/63+2/99+2/143=?
简便计算：20-2/3-2/15-2/35-2/63-2/99
3分之2+15分之2+35分之2+63分之2+99分之2
2/3+2/15+2/35+2/63+2/99 简便计算,
2/3+2/15+2/35+2/63+2/99=?
简算：20-2/3-2/15-2/35-2/63-2/99