2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
问题描述:
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
计算..
答
2/1x3+2/3X5+2/5x7+2/7x9+2/9x11=1-1/3+1/3-1/5.+1/9-1/11=1-1/11=10/11
2/1x3+2/3X5+2/5x7=2/7x9+2/9x11
计算..
2/1x3+2/3X5+2/5x7+2/7x9+2/9x11=1-1/3+1/3-1/5.+1/9-1/11=1-1/11=10/11