1/1x2+1/2x3+1/3x4+1/4x5+…+1/10x11
问题描述:
1/1x2+1/2x3+1/3x4+1/4x5+…+1/10x11
答
原式=1-1/2+1/2-1/3+1/3-1/4 +1/10-1/11=1-1/11=10/11
1/1x2+1/2x3+1/3x4+1/4x5+…+1/10x11
原式=1-1/2+1/2-1/3+1/3-1/4 +1/10-1/11=1-1/11=10/11