1—6 bbbccbc 7.82 28 . d ecde∠d 60 9。 ∠cadcd 10.30 1 1。 I don't know.

Homework 2

1—4 DDCC 5.20 6.247。 I don't know.

Homework 3

1—5 ADADC 6。 4 7.2.4 8.6

Homework 4

1—5 DCBCB 6。 70 40 50 or 20 7. 35 8. 108.

Homework five

1—6 CBBA？ B 7。 80 8. 100 ? : I don't know

Homework six

1-5 DC 6 Central Business District. ≥ 3/27.58. > 9.110.33 Number of main roots 3 1 1. - 1 9.

Homework 7

1—4 DDAD 5。 T=20-6h 20 h、T h 6。 Q=600000-t p 600000、P Q、t 7。 x≥ 1/2

Homework 8

1—5 ACADC 6。 -3 7.y=2x+ 1 - 1 8.m2 5。 -3 -2 (-5/8,- 1/8) 6.3/4 7.x=-2

Homework eleven

1—9 CBABDBAAD 10。 The sixth power of 28a 1 1. 2(a+b) to the fourth power.

Homework 12

1-5bcda6.x to the fourth power-1 7. ( 100- 1) ( 100+ 1) = 100? -1 8.(- BC)? -(3a？ ) 9.9 10.(-7p-q？ ) 1 1.3

12 to the fourth power. x -2a？ x？ The fourth power of +a is 13. Answer? -2ac+c？ -B?

Homework 13

1—9 CDAD 10.52 1 1.7 12. 1/24 13。 I don't know 14. (b-a-c)

Synthetic test

1-5bbbbcb6。 (-2, -3) 7.-3a- 1 a 12 to the power of 8. 38 9.2