Phuong trinh bac cao

PHONG TRINH BAC CAO

Bài 1: Giải các phong trinh

— x†+5x+6 x+7x+l2 xế +llx+30

2)(x)+4x+8|' +3x|x? +4x+8]+2x? =0

3)2x —1)(6x —1)(4x —1)(3x —-1) =330

4)x* =3x° +10x+24

5)x* = 7x +18x+4

6)x* =2x° +8x+3

7)(x+1)(x+3)(x+5)(x+7) =-15

8)(x+ 2)(x + 5)(x — 6)(x— 9) = 280

9)(x* +7x+12)(x* —15x+56) =180

10)(x +10)(x +12)(x+15)(x +18) = 2x°

11(x—90)(x—35)(x+18)(x+7) =—1080c7

12)(x* +16x + 60)(x° +17x +60) = 6x°

13)(x° +5x+8)(x° +6x+8) =2x°

14)(x—4)(x—5)(x—8)(x—10)= 72x”

4

Bài2: Giải các phơng trình sau :

1)2x* -13x° +24x° -13x+2=0

2)x* -10x° +11x* -10x+1=0

3)x* +5x° +10x* +15x+9 =0

4)x* +5x° -14x° —-20x +16 =0

5)3x° —4x° +2x* —8x° +2x? —4x +3 =0

6)(x+3)' +(x-1)" = 626

7)(x—2,5)° +(x-1,5)° =17

8(x+5) =(x+1)ˆ =80

Bài 3: Giải các phơng trình sau :

1) x*— 6x? + 54x -81=0 2) (x* — 6x + 9)? —15 (x* — 6x +9) =

1

3)6x° — 29x* + 27x? + 27x* — 29x +6=0 A) (x+ 1)? + (x- 2) + (I- 2x)? =0

(2 Ly, 2 x-2) _ 49

x x+2 x+5 x+7 x4 x+3 x+4 x+6

7)x° (x—4)* +16x° -30( x4)” =0 14x52 *( 452% Jag

xà x+1 xi

510 xt] x- 17 =11-= xỉ —] 15)x° —6x' —6x? +1=0

4

10)x* — 4x7 — 19x? +106x-120=0 17)x` =24x+32

Lx! —4x° -10x? +37x-14=0 jg 2th oe ed era

12)x +3xˆ-9x+9=0

13)4(x+5)(x+6)(x +10)(x +12) =3x°

19)(x?-6x+9)° =x{ x? —4x-9]

20)|x?—~3x+1]|x? +3x+2||x”~9x+20] +30 =0

21)x' +(x+1)|5x”—6x—6] =0

22)(x+1)' =2{1+ x!]

23)(x? +1] +(x+2)(3x?~4x—5] =0

298 3)

Voix 2 0

4

2syen[ Fre]

8

26|x°+3x—4|' +3(x°+3x—4] =x+4

|

27)(x+1] +(x+2)]Ì+(x+3)” =2

2

28) x+lŸ „x1 l1 x-2Ì

x-2J x-4 x-4 J

x-l3x+l§ x-l5x+l§ -l

x -l4x+l5 x°-16x4+15 12

3x7

3

(x1) x-l

30)x° +

31) 2 + 2 — 2

x-3x+3 x-3x+4 xế -3x+4

(x+1)(x+2) (x-1)(x+4)

2

33)x2 +O - = 40

(x+9)

2

34)x? +> =15

(x+]]

2x°-5x+3 2x°+x+4+3

4x -8x+7 4x°-10x4+7

2

37)2 10x+15 _ 4x

x —6x415 x?-l2x+5

Bài 4: Với những gia tri nao cua a thi phong trình

x? + (1 — 2a) x? +a7— 1=0

a) Vô nghiệm

b) Có một nghiệm

c) Có hai nghiệm

d) Có ba nghiệm