1/1*2+2/2*4+3/4*7+.+9/37*46+10/46*56求解
问题描述:
1/1*2+2/2*4+3/4*7+.+9/37*46+10/46*56求解
答
1/1*2+2/2*4+3/4*7+.+9/37*46+10/46*56
=1-1/2+1/2-1/4+1/4-1/7+.+1/37-1/46+1/46-1/56
=1-1/56
=55/56