知ab-2的绝对值与b-1的绝对值互为相反数,试求代数式1⼀ab+1⼀(a+1)(b+1)+1⼀(

2025-01-01 14:15:24
推荐回答(2个)
回答1:

由题ab-2的绝对值与b-1的绝对值互为相反数,

得ab-2=0 b-1=0
则, a=2 b=1
1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+……+1/(a+2013)(b+2013)
=1/2+1/(2x3)+1/(3x4)+……1/(2014x2015)
=1/2+(1/2-1/3)+(1/3-1/4)+……+(1/2014-1/2015)
=1-1/2015
=2014/2015

回答2:

拉了这么久答案就是ab