江苏省兴化市顾庄学区2017_2018学年度七年级数学上学期期中试题.doc

1、 2017-2018 120 150 1 2 0 5 6 3 18 . 1. 6 6 8 A 8 B 8 C 14 D 2 2. 7 22 0 3.1415926 2.010010001 3 5 A 2 B 3 C 4 D 5 3. 3 9 y x m n y x 2 4 n m A 2 B 3 C 4 D 5 4. a b a b 0 a b 0 A a b B a b C a b D a b 5. A B C D 5 6. 2 x 2 ax 4 2 x 2 ax A 4 B 8 C 8 D 2 10 3 30 7. 321 281 200 406 180 309 8. . . 9. A B

2、 2 A 1 B 10. a b a b b a a b a b 3 ( 1) . 11. 0 ) 2 ( 1 2 y x y x . 12. 0 ab a b ab a b ab 13. b a 3 5 4 ) 2 ( 4 ) ( 2 b a b a . 14. , abc , A B C a b b c c a . 15. x y M 2017 x y . M M=a+x+y a =y x a =x y x y x y 15 16. 1 6 . x O C A B 14 16 10 102 17. 8 1 7 4 5 2 7.2 0.8 5.6 11.6. 18. 8 1 100 8 1

3、8 2 16 - 16 15 19 . 19. 10 1 x x 2 10 3 2 x 2 1 1 3 x. 20. 10 1 4 4 2 ) 2 ( 5 3 ) 2 ( 2 4 1 6 5 9 8 6 1 2 2 ) 2 ( 14 21. 10 1 1 4 2 2 a a 5 2 3 2 a a 2 c c b a b a 2 ) 2 5 ( 8 ) 2 9 ( . 22. 8 ) 2 ( 4 ) 2 ( 8 ) 2 ( 3 ) 2 ( 5 y x y x y x y x 2 1 x 3 1 y . 23. 10 2 , 1 . 12 , 20 . 1 x 2 1 24. 12 2 12 6

4、 6 1 5 2 n m 3 2 3 1 2 . 25. 12 1 5 x x a ax 20 8 a 2 x 6 3 ) 1 ( 2 a x 1 3 2 x 2017 a 3 x 21 2 ax x ax . 3 x a . 26. 14 1 2 3 4 1 1 2 1 2 . 2 1 16 A B C D. A x. D C B A 26 1 26 2 1 1 2017 2 D C B A 3 1 . 1 m n m n w m n w D C B A 3918? A . 2017 3 18 . 1 2 3 4 5 6 B A D D B C 3 30 . 7.6 8.2.6 13 10

5、9.1 3 10. 1 11.3 12. 1 13. 8 14.2b 15.1008.5 16.91. 10 102 17. 8 1 7+4 5 11 5 6 2 = 8 6= 2. 4 18. 8 1 =100 8 8 = 6400 2 = 16 20 16 1 = 320+1= 319. 4 19. 10 1 3x+2x=10. 5x 10. 1 x=2 2 x 2 1 + x 3 1. x 2 3 2. 1 x= 3 4 . ( 5 ) 20. 10 1 5+16 +2=13 2 = 4 1 6 5 + 9 8 36+4 14 = 9 30+32-56= 63 ( 5 ) 21. 10

6、1 (2a 2 -4a+1)-( -3a 2 +2a-5)= 2a 2 -4a+1+3a 2 -2a+5=5a 2 -6a+6 1 =9a-2b-(8a-5b+2c)+2c=9a-2b-8a+5b-2c+2c=a+3b.( 5 ) 22. 8 x 2y a 5a 3a+8a 4a 6a. 2 1 x 3 1 y a x 2y 2 1 3 2 6 1 6 6 1 1. 23. 1 ) 12 ( x 2 20 ) 12 ( 2 x x (3 ) 2 8 x 3 4 2 . 24. 10 1 6 1 5 2+12 3 1 ( 5 6) 3 11 3 1 =4 5 2 6 1 2 2m 3n +12

7、3 1 (2m+3n) 6) 2 ) 3 2 ( 3 1 2 ) 3 2 ( 3 1 n m n m =4.(5 ) 3 4. 2 25. 12 1 x=5 ax 8=20+a 5a 8=20+a a=7 2 1 3 2 x 2 x 6 3 ) 1 ( 2 a x 2 1 x 3 6 3 a 1 a 1 2017 a . 3 2x+ax -21 x= 3 6-3a=-21 a=5. 2x=5x-21 x=7. a=5 x=7. 4 26. 1 253 1 (2 ) 2 A-B+C-D=x-(x+24)+x+27-(x+3)= x-x-24+x+27-x-3=0 A-B+C-D 0. (4 ) 3 n w n m ) 1 ( 8 n m 8 8 n w ) 1 ( 8 n m n m 8 8 . 1 2 4 w n ) 1 ( ) 8 8 ( n m .(4 ) 3278 A B C D . A x 24 x B ) 3 ( x C ) 27 ( x D . D C B A 27 3 24 x x x x 54 4 x 3918 966 x A 966. 2 966 8 120+6 A 121 6 . 2 3 C D D C B A 3918. 2