1. inverse: if a=b, then | a | = | b | is true.

2. If three line segments intersect at a point in the triangle, then those three line segments are the bisectors of the three angles of the triangle; wrong

3.B 4。 D 5。 C 6。 D

Day 13

1.20 cm2 2.4.5 3.69 degrees; 27 degrees; 10 4.(4 times the radical number 3+6) 5.12-6 times the radical number 2 6.30 degrees 7.2 times the radical number 3.

Day 14

1.5 2.6; 12 3.45 degrees 4.8+8 root number 3 5. (-2, 2 times the root number 3); (-2, -2 times the root number 3)6. B 7。 C

Day 15

1.2% 1a 2.96 3.4% root number 3 4.2 times root number 5 5. 1.2 6.2% 3+ root number 3 7. 1 8.5% 2 times root number 2 1.

9. 15 degrees10.61.d12.a13.c14.b15.3.

Day 16

1 .isosceles 2. The intersection of two circles with m, n as the center and 6cm as the radius is 3.45 degrees 4.6 or-1.5.4 6.30 degrees 7. (0,3); (-6,0)

8. 14+2 root number 13 9. C 10。 B 1 1。 D 12。 B 13。 Root number 2.

17 days

1.( 1)+or- root number 2 (2)- root number 2 (3) 1 3. -1 4.4 1 5. The inverse ratio is 6. Root number 27. 1.655.

8.+ or -5 radical 15 9.x is not equal to 2, and x is not equal to 3. All real numbers 10. -2 is less than x and greater than or equal to a quarter of 3112.d13.b14.

16.y = 9/x17.y =-4/x18.y =-6x or y =-2x/3.

18 days

1.3 2.y = 1000-PT； 0 is less than or equal to t is greater than or equal to 1000 3.y=+ or -3 1x 4. -1 5. One, three 6. 1 7. Third; (-2,-3); 3/2; six

8.x is greater than or equal to o, and x is not equal to 49. - 1 10.y = 3x+ 1 1 . c 12 . b 13 . b 14 . c。

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