求Y=10-1/2+1/3-1/4+1/5…前30项之和.要求:按四舍五入的方式精确到到小数点后俩位.

Question

求Y=10-1/2+1/3-1/4+1/5…前30项之和.要求:按四舍五入的方式精确到到小数点后俩位.

Answer 1

y=1-1/2+1/3-1/4+1/5+……+1/30 (10应是笔误吧)
= 3.994987
=3.99