(二乘四)分之一加(四乘六)分之一加(六乘八)分之一......(二零零七乘二零零八)分之一等于多

2024-12-12 20:39:57
推荐回答(2个)
回答1:

你好
1/(2*4)+1/(4*6)+1/(6*8)+……+1/(2010*2012)
=(1/2)*[2/(2*4)+2/(4*6)+2/(6*8)+……+2/(2010*2012)]
=(1/2)*(1/2-1/4+1/4-1/6+1/6+1/8+……+1/2010-1/2012)
=(1/2)*(1/2-1/2012)
=1005/4024
满意请采纳

回答2:

=1/2(1/2-1/4+1/4-1/6+1/6-1/8+…+1/2006-1/2008)
=1/2(1/2-1/2008)