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Find the first n items and answers of arithmetic progression, a compulsory math course in senior high school [Exercise 2.3].
Group a

1。 ( 1)n(n+ 1)(2)n^2③98550④494550

2.( 1)d= 17/ 13，n=27 (2)a 1= 1 1，an=23 (3)n= 15，an=-3/2 (4)a 1=-38，Sn=-360

3.45500m.

4.n=4

5.665

6. 1472

There are too many procedures to type.

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