( 1)

Line 2 and line 1: The quadratic power of x in line 1 is equal to line 2, such as (-1) 2 = 1. (-2)^2=4

Line 3 and line 1: the square of line 1 plus 1 equals line 3, such as (-1) 2+ 1 = 2. (2) 2+ 1 = 5.

Line 4 and line 1: the square of line 1 times 2 equals line 4.

Such as (-1) 2 * 2 = 2. (2) 2 * 2 = 8.

(2)

Line 1 ninth digit -9

Line 2, 9th place (-9) 2 = 8 1

Line 3, 9th bit (-9) 2+ 1 = 82

Line 4, 9th (-9) 2 * 2 = 162

-9+8 1+82+ 162=3 16

the second question

The last number is 5.

Third question

85^2=8*(8+ 1)* 100+25

95^2=9*(9+ 1)* 100+25

1995^2= 199*( 199+ 1)* 100+25

2005^2=200*(200+ 1)* 100+25