(2) 13/36

③3m, 40 pages

(4) 55/2

(5)-2

2.

(1)25 pieces

(2)3n+ 1

(3)30 1 root

3.

5n+6 1 1 16 2 1 26 3 1 36 4 1

6n- 1 5 1 1 17 23 29 35 4 1

(1) Add 5 to the first one and 6 to the second one.

(2) The second algebraic expression

4.

4 9 kwh

5.

These two figures are the same. The first is -2 1, and the second is 5 out of 36.