.5,( 1)6

(2)4

6,(23

)

(

13、 19)

Second, 1,

(1) 3+11* 4 = 47 (pieces)

(2)(75-3)/4= 18 (heap)

2,( 1)4+3*4

,4+3*5

，4+3(x- 1)

(2) Question 1: 4+3* 14=46 (root)

The second question: 6 1-4/3= 19 (pieces) 19+ 1=20 (pieces)

50 pages: 1,

(3)

(3)

(2)

(3)( 1)

Two. 1,50000703000

, 3.07 billion

3.07 billion

2, kg, cm, 4.05, 2: 00 18.

3, omitted. 4，2 1，2 1: 1

5 1+2(n- 1)

6,8: 00 10

Page 5 1. I'm tired of playing. I hope the landlord will get extra points.