Mathematics final paper of grade one 8. If the ratio of the two angles is 7 ∶ 3 and the difference is 72 degrees, the relationship between the two angles is () (A) Equality (b) mutual complement (c) complementarity (d) cannot be determined 9. The charging standard of a taxi is: the starting price is 6 yuan (i.e. the driving distance is less than 3 km, you need to pay 6 yuan). After 3 km, you will be charged 1.5 yuan for every additional kilometer (less than 1 km is counted as 1 km). Someone will pay 18 yuan for taking this kind of taxi from place a to place B. if the distance from place a to place B is 1 km, the maximum value is () （A）7 （B）9 （C）10 （D）11 10. Party A and Party B each use a square piece of paper ABCD to fold a 45 ° angle (as shown in the figure), and their methods are as follows: A: fold the paper along the diagonal AC so that point B falls on point D, then ∠ 1 = 45 °; B: fold the paper along am and an so that B and D respectively fall on a point P on the diagonal AC, then ∠ man = 45 °. For the two people's practice, the following judgment is correct () A) Both a and B are right (b) both a and B are wrong (c) both a and B are wrong (d) both a and B are wrong

Mathematics final paper of grade one 8. If the ratio of the two angles is 7 ∶ 3 and the difference is 72 degrees, the relationship between the two angles is () (A) Equality (b) mutual complement (c) complementarity (d) cannot be determined 9. The charging standard of a taxi is: the starting price is 6 yuan (i.e. the driving distance is less than 3 km, you need to pay 6 yuan). After 3 km, you will be charged 1.5 yuan for every additional kilometer (less than 1 km is counted as 1 km). Someone will pay 18 yuan for taking this kind of taxi from place a to place B. if the distance from place a to place B is 1 km, the maximum value is () （A）7 （B）9 （C）10 （D）11 10. Party A and Party B each use a square piece of paper ABCD to fold a 45 ° angle (as shown in the figure), and their methods are as follows: A: fold the paper along the diagonal AC so that point B falls on point D, then ∠ 1 = 45 °; B: fold the paper along am and an so that B and D respectively fall on a point P on the diagonal AC, then ∠ man = 45 °. For the two people's practice, the following judgment is correct () A) Both a and B are right (b) both a and B are wrong (c) both a and B are wrong (d) both a and B are wrong

8 72 / (7-3) = 18 18 * 3 = 54 18 * 7 = 126 54 + 126 = 180 (c) complementary
9 (18-6)/1.5+3=11 （D）11
10 A