2/2x4+2/4x6+2/6x8.2/8x10+2/10x2
问题描述:
2/2x4+2/4x6+2/6x8.2/8x10+2/10x2
答
2/2x4+2/4x6+2/6x8.2/8x10+2/10x2
=1/2-1/4+1/4-1/6……+1/8-1/10+1/10
=1/2