1/2×4+1/4×6+1/6×8+.+1/2006×2008 等于多少
问题描述:
1/2×4+1/4×6+1/6×8+.+1/2006×2008 等于多少
答
1/2×4+1/4×6+1/6×8+.+1/2006×2008
=1/4(1-1/2+1/2-1/3+1/3-1/4+------+1/1003-1/1004)
=1/4(1-1/1004)
=1003/4016