ข้อสอบระบบสมการ A.pdf

Jan 12, 2016

Documents

• 3

3

-

1. 7

x

y

. x - 7 = y

. x + 7 = y

. x + y - 7 = 0

. x + 7 = y 7

2.

. xy = 1

. y

1 -x = 2

. 3x y 1 = 0

. x = 3 - x y

2

3. 3x + 2y = 5 y

y

. 0

. 1

. 2

. 2.5

4.

. 2x y = 10 3x + xy = 9

. 5 ( x + y ) xy = 11 x y = 4

. 8x + 2y = 5 7x + xy = 12

. 3x 5y = 2 x + 15 = y

5.

. 12y4x3 , 12y4x3 . 1yx2 , 1yx2 . 9y7x , 9y7x . 4y2x3 , 8y4x6 6. ( a , 2 )

2x 3y = 4 a

. -2

. 0

. 5

. 10

7. 643 yx

13

1

4

1 yx

. 1

. 2

. 3

. 4

8. 923 yx

112122 yx

. 1

. 2

. 3

. 4

A

1

• 9. y 2x = 4 x + y = 1

. (0, 2)

. (2 , 0)

. (0 , 2)

. (2 , 0)

10. 2x + y = 23

4x y = 19

. (2 , 9)

. (9 , 7)

. (2 , 27)

. (7 , 9)

11. 2x y = 5 x + y = 4

2x

. 2

. 3

. 6

. 9

12.

a + 2 = 2b + 3 2a 5b = 4

. (2 , 7)

. (2 , 3)

. (3 , 2)

. (7 , 2)

13. y = 2x 7x y = 25

3x y

. 15

. 10

. 5

. 0

14. x y

x + y = 12 x y = 2

. x = 5 , y = 7

. x = 7 , y = 5

. x = 5 , y = 7

. x = 7 , y = 5

15. ba, 16y7x2 0yx2 ab

. 2 . 1 . 1

. 2

16. ts, 70y40x30 ... 021y50x60 ... t5s9

. 12 . 7 . 13

. 17

17. ba, 09

5

3 yx 4

2

1

3

1 yx

b9a2 . 56 . 16 . 52

. 54

2

• 18. 02y4x3 016ayx6 a

. 2

9

. 8 . 8

. 2

9

19. nm, 01185 yx

0112413 yx n4m2 . 12 . 2 . 1

. 12

20. (x, y)

2x + y = 4 x 2y = 2 xy

. 0

. 2

. 10

. 16

21. 643 yx

1246 yx

.

2

3,0

. 3,2

.

4

3,3

. 0,2

22. 2x-3y+24= 0 X

Y

. (8,0) (0,12)

. (-8,0) (0,-12)

. (12,0) (0,8)

. (-12,0) (0,8)

23.

. x + 2y = 5

. x 2y = 4

. 2x y = 3

. 2x + 3y = 2

24.

. 5x y = 1

. 4x y = 2

. x + 4y = 1

. x 4y = 2

3

• 25. 3x 2y = 1

2x + y = 4

.

.

.

.

26. 84

6

. 35

. 37

. 39

. 45

27. 25

40

30

. 2:1

. 3:1

. 3:2

. 3:4

28. 17

52

. 7 10

. 8 9

. 9 8

. 10 7

29. 2

4

6

. 15

. 51

. 62

.

30. 100

46

. 36

. 18

. 1

.

5

-5

-5 0 5

5

-5

-5 0 5

5

-5

-5 0 5

5

-5

-5 0 5

4

• 5

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