第9章复习题 1.C. 2.D. 3.B 4.C. 5.B. 6,C. 7.B. 8.15. 9.2 10. 4. 8. 11.(4,2) 12.√2. 13. 5. 14.(1)(1,-1); (2)略; (3)y=-½x+½ 15.略. 16.(1)略; (2)2. 17.(1)略; (2)四边形ADCE为菱形. 18.(1)略; (2)菱形,证明略; (3)2:1. 19.(1)略; (2)15/2 |
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