1.已知a是不為1的有理數(shù),我們把
稱為a的差倒數(shù).如:2的差倒數(shù)是
,3的差倒數(shù)是
.現(xiàn)在已知
,a
2是a
1的差倒數(shù),a
3是a
2的差倒數(shù),a
4是a
3的差倒數(shù)…a
2025是a
2024的差倒數(shù).
(1)分別求出a
2,a
3,a
4的值;
(2)根據(jù)(1)的計(jì)算結(jié)果規(guī)律,計(jì)算a
2023+a
2024+a
2025的結(jié)果;
(3)計(jì)算:a
1+a
2+a
3+…+a
2023+a
2024+a
2025.