问题
解答题
(1+
|
答案
(1+
)+(1+19 92
×2)+(1+19 92
×3)+…+(1+19 92
×15),19 92
=15+
×(1+2+3+…+15),19 92
=15+
×120,19 92
=39
.18 23
(1+
|
(1+
)+(1+19 92
×2)+(1+19 92
×3)+…+(1+19 92
×15),19 92
=15+
×(1+2+3+…+15),19 92
=15+
×120,19 92
=39
.18 23