2/3x5+2/5x7+…+2/31x33
问题描述：
2/3x5+2/5x7+…+2/31x33
答
2/3x5+2/5x7+…+2/31x33
=(1/3-1/5)+(1/5-1/7)+…+(1/31-1/33)
=1/3-1/33=10/33