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阜宁县陈集中学七年级上数学周末作业(第十二周)

发布时间:2014-01-02 14:39:49  

阜宁县陈集中学七年级数学周末作业(第十二周)

解下列方程: 1、1? 15、

1

?3x?5??1?x?2??7 16、x?x?1?5 17、x?1?x?x?x?x 232224816

x?31?2xx?13x?2 2、???3 3、5?2x?3??6?1?2x??3

2732

18、2x?3x?67x?8

19、0.6?4?x??5?0.2x?0.34??5.3?0 ??

4、2?2?3x?1??4??2x?5 5、5x?2?x?5?3?x?5???1 6、3?7x1?4x

5?3

?1 7、1?x?23?1?2x5 8、x?96?x?23?x?1 9、x

5

?1.5??1.2x?2

10、3?5?1.2x??1.4??2?0.3x?1? 11、1?x??2?3x?2??1 12、2313

3x?2?4x?4

13、?6x?5???2x??4x?1????24 14、0.360.2?0.09x?0.18

0.9

?0.05

2510

20、0.5?3?2x??0.25?6x?1??1

23、0.5x?2?0.2x?0.1??0.8 24

26、2x??5x?16??3?2?3x?4?

29、69?x?3

4

?78??x?1?? 30

- 1 -

、x?14?3x?13 22、2x?x?1

2

?8、x?6?3

5

x?2 25、5x??

1?2?x??x?2????4 、x?1?x3?xx9?

27 28、2x?1?23x?7

3

、4?x?3??2?x?7??6x?10 21 27

31、

1

?x?3??1?x?6??1 32、?3?x???5??2x??x?1????1 34

43、1.1x?5?0.4x?2?x?2? 44、1.5?

45、x?1?0.720.03x?0.06

?

0.40.3

33、5x?2??x?5??3?x?5???5?x?4??8 34、4?3?2?x?1??7??6??3?225 4440.7x?0.30.4x?0.1

x?x?x 46、?

35、1?1?1?1???5??4??3??2x?1??????1?0? 36

37、1?2?1??1?4?1?5x?1???

?3????2???3??4?

38 39、2x?1x3??32 40

41、3x?15x?3x?22?6?

3 42

、2x?5???

1?3x?2???1?52x???

????99?0、x14?2?x2?34

、2x?110x?123?6?x?1

4

?1

、13x?2??11?3

2?5?3x???5

x?3 525125 47、2

5?x?3??32?x?4???54x?115 49、3?7x1?5?4x

3??1 50

- 2 -

0.50.3

、3x?13

?19?x??33 、5x?37???4x?1?11?x?6???14

48

参考答案:

1.

1?

x?31?2x

2?

7 x??3 2. x?13?3x?22

?3 x?2

3.

5?2x?3??6?1?2x??3 x??12

4. 2?2?3x?1??4??2x?5 x??1

10

5. 5x?2?x?5?3?x?5???1 x?7

6.

3?7x1?4x

5?3?1 x?19 7. 1?x?21?2x3?

5 x??2 8. x?9x?26?3?x?1 x??1

9. x5

?1.5??1.2x?2 x?52

10. 3?5?1.2x??1.4??2?0.3x?1? x?4.8 11. 1?x??2?3x?2??1

x?25 12. 23x?313

2?4x?4

x?95

13. ?6x?5???2x??4x?1????24

x??514. 0.360.2?0.09x?0.18

0.9?0.05 x?19.5 15. 1

?3x?5??123?x?2??72 x?

40

11

16. x?x?1

2

?5

x?9 17. x?1?x2?x4?xx

8?16

x?

1611

18.

2x?3x?67x?8

2?5?

10

x??1

19. 0.6?4?x??5?0.2x?0.34??5.3?0 x?15

4

20.

0.5?3?2x??0.25?6x?1??1 x?0.1

21.

x?

14?3x?13

x?1

24 22. 2x?x?1

2

?8

x?5 23. 0.5x?2?0.2x?0.1??0.8 x?6

24. x?6?

3

5

x?2

x?9

25. 5x??1?2?x??x?2????4

x?1

26.

2x??5x?16??3?2?3x?4? x?9

27. x?1?x3?x9?x

27

x?2734

28. 2x?1?23x?7

3

x?1 29. 69?x?3

4

?78??x?1??

x?45

30.

4?x?3??2?x?7??6x?10

x??3

31. 13?x?3??1

4

?x?6??1

x?42

32. ?3?x???5??2x??x?1????1

x??1

33. 5x?2??x?5??3?x?5???5?x?4??8 x??134.

4?3?2?x?1??7??6??3?225

x?4

35.

1?1?1?1??5???

x?1???

??1?0

?4?3?2???

x??118

36. 2x?5??1?3x?2??5?1?

2x???

????

?99?0 x??2

37. 1?2?1??1??4?1?5x?1????2???

??3??4

?3?

x?705

38.

x4?12?x2?34 x??5 39. 2x?1x?33?

2

x?11

- 3 -

40. 2x?110x?123?6?x?1

4?1 x?

1

6

41. 3x?12?5x?36?

x?23

x??5 42.

13x?2??1?5?13x????3

5

x?23 x?

27

43. 1.1x?5?0.4x?2?x?2? x?

10

3

44. 1.5?0.720.03x?0.4?0.06

0.3 x??1

45. x?1?445x?25x?4125x x?125

46. 0.7x?0.30.4x?0.1

0.5?

0.3 x?4 47.

2

5?x?3??32?x?4???54x?115

x??4048.

3x?1

3

?19?x??33 x?10

49.

3?7x5?1?4x

3??1 x?19 50.

5x?3?4x?1?7???

x?6???11

14 x?1

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