- แบบฝึกหัดที่ 3
แก้สมการโดยใช้สูตร
1. x - 7x + 6 = 0 3 0 - | )
6.
7 - ๆ 0 - 6
)
/2. n + 3n + 2 = 0 - 0. 2 1 ) 6 - 3 ) 0 9
3. 2y + y - 1 = 0 -ๆ 0 2 9 , 6 3 1 , 0 - - |
/4. 3p + 5p + 2 = 0 -3 0 2 2 2 - 5 , 0 2
* + 6x + 9 = 0 3 0 = \ , b = b C 4
Am 4m + 1 = 0 0 7 4 1 5 - - 4 0 |
** 10x = - 25 -9 19 K 425 - 0 4 0 = \ ) 5 + 10 0 2 265
A8. n + 2n = 24] 3
* = y +2 ฯ -4 -9 -0 - 0 - 1,6 - !, 0 7 - 3
5.
/6.
/7.
ทั้ง 2ท - 4 =2 -2 0. 1 \ ,5 2 2
C = - 24
* -09 10 2% - 10 = x 2% * \0 0 * 0 2 2 6 4-1,0 - 10
V - 9 = 0 - 0 |, 6 = 0 C% - 9
5ๆ 20-0120 5m = 20) -- 0. 5, 6- 20 , 0 26
11
)
* - 3x + 1-0 + x*-3x - 0 - 4 - ) 6- - 3 , 02 0
น 5น-9540 y = 5y 421, 6 -5 0 - 0
15.
2 - 22 - 2 = 0 - 4- | ,6 3 - 9
/16. x - 10x = -4 - x- 10x + 4
6ะ
0 - 0 : 1) 6 - 3 0 = - 4
* - 2 = 4x 3 - 4x -9 - 0 9 081 64-4 C- 1
19. 2 - 8y + 9-0-99 89 +7 : 0 - 0 - 9, 6 -8, 0 13
20. 4x = 2x + 1 -9 4x 3x - 1-0 - 0 2 4, 62 - 9 0 2 -1
-/0) C < 4
- 0
17.
9
18.
9.
128
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