Các câu hỏi tương tự
Bài 11: Tìm x biết:
a) (x+2)(x2-2x+4) - x(x2+2) =15
b) (x+3)2 –x(3x+1)2 +(2x+1)(4x2 -2x+1) =28
c) (x2-1)3 - (x4+x2+1)(x2-1) = 0
d) (x-2)3 –(x-3)(x2 + 3x+9) +6(x+1)2 = 49
1) Giải phương trình: x(x-3)-(x+2)(x-1)=3 ta được nghiệm
2) Phương trình nào sau đây có 1 nghiệm
a) x(x-1)=0 b) (x+2)(x2+1)=0
c) x2-3x=0 d) x2-2x+3=0
c) C x(y2 +z2)+y(z2 +x2)+z(x2 +y2)+2xyz.
d) D x3(y−z)+y3(z−x)+z3(x−y).
e) E (x+y)(x2 −y2)+(y+z)(y2 −z2)+(z+x)(z2 −x2).
b) x2 +2x−24 0.
d) 3x(x+4)−x2 −4x 0.
f) (x−1)(x−3)(x+5)(x+7)−297 0.
(2x−1)2 −(x+3)2 0.
c) x3 −x2 +x+3 0.
e) (x2 +x+1)(x2 +x)−2 0.
a) A x2(y−2z)+y2(z−x)+2z2(x−y)+xyz.
b) B x(y3 +z3)+y(z3 +x3)+z(x3 +y3)+xyz(x+y+z). c) C x(y2 −z2)−y(z2 −x2)+z(x2 −y2).
Đọc tiếp
c) C = x(y2 +z2)+y(z2 +x2)+z(x2 +y2)+2xyz.
d) D = x3(y−z)+y3(z−x)+z3(x−y).
e) E = (x+y)(x2 −y2)+(y+z)(y2 −z2)+(z+x)(z2 −x2).
b) x2 +2x−24 = 0.
d) 3x(x+4)−x2 −4x = 0.
f) (x−1)(x−3)(x+5)(x+7)−297 = 0.
(2x−1)2 −(x+3)2 = 0.
c) x3 −x2 +x+3 = 0.
e) (x2 +x+1)(x2 +x)−2 = 0.
a) A = x2(y−2z)+y2(z−x)+2z2(x−y)+xyz.
b) B = x(y3 +z3)+y(z3 +x3)+z(x3 +y3)+xyz(x+y+z). c) C = x(y2 −z2)−y(z2 −x2)+z(x2 −y2).
e, x2-4+(x-2)2 = 0
f, x3+1=x(x+1)
g, x2(x-3)+12-4x = 0
h, (2x-1)2-(x+3)2 = 0
Tìm x, biết:a) 3x(x - 1) + x - 1 0;b) (x - 2)(
x
2
+ 2x + 7) + 2(
x
2
- 4) - 5(x - 2) 0;c)
(
2
x
-
1
)
2
- 25 0;d)
x
3
+ 27 + (x + 3)(x - 9) 0.
Đọc tiếp
Tìm x, biết:
a) 3x(x - 1) + x - 1 = 0;
b) (x - 2)( x 2 + 2x + 7) + 2( x 2 - 4) - 5(x - 2) = 0;
c) ( 2 x - 1 ) 2 - 25 = 0;
d) x 3 + 27 + (x + 3)(x - 9) = 0.
Giải các phương trình tích sau:1.a)(3x – 2)(4x + 5) 0 b) (2,3x – 6,9)(0,1x + 2) 0c)(4x + 2)(x2 + 1) 0 d) (2x + 7)(x – 5)(5x + 1) 02. a)(3x + 2)(x2 – 1) (9x2 – 4)(x + 1) b)x(x + 3)(x – 3) – (x + 2)(x2 – 2x + 4) 0c)2x(x – 3) + 5(x – 3) 0 d)(3x – 1)(x2 + 2) (3x – 1)(7x – 10)3.a)(2x – 5)2 – (x + 2)2 0 b)(3x2 + 10x – 8)2 (5x2 – 2x + 10)2c)(x2 – 2x + 1) – 4 0 d)4x2 + 4x + 1 x24. a) 3x2 + 2x – 1 0 b) x2 – 5x + 6 0c) x2 – 3x + 2 0 d) 2x2 – 6x + 1 0 ...
Đọc tiếp
Giải các phương trình tích sau:
1.a)(3x – 2)(4x + 5) = 0 b) (2,3x – 6,9)(0,1x + 2) = 0
c)(4x + 2)(x2 + 1) = 0 d) (2x + 7)(x – 5)(5x + 1) = 0
2. a)(3x + 2)(x2 – 1) = (9x2 – 4)(x + 1)
b)x(x + 3)(x – 3) – (x + 2)(x2 – 2x + 4) = 0
c)2x(x – 3) + 5(x – 3) = 0 d)(3x – 1)(x2 + 2) = (3x – 1)(7x – 10)
3.a)(2x – 5)2 – (x + 2)2 = 0 b)(3x2 + 10x – 8)2 = (5x2 – 2x + 10)2
c)(x2 – 2x + 1) – 4 = 0 d)4x2 + 4x + 1 = x2
4. a) 3x2 + 2x – 1 = 0 b) x2 – 5x + 6 = 0
c) x2 – 3x + 2 = 0 d) 2x2 – 6x + 1 = 0
e) 4x2 – 12x + 5 = 0 f) 2x2 + 5x + 3 = 0
Tìm x biết:a/ x2 - 6x 0 b/ ( 3x – 1)2 – ( x + 5)2 0c/ 9x2 ( x- 1) x – 1 d/ x2 – 4 ( x – 2)2e/ x + 3 – ( x + 3)2 0 f/ x3 – 0,36x 0g/ 5x( x- 2018) – x + 2018 0 h/ x( x- 5) – 4x + 20 0
Đọc tiếp
Tìm x biết:
a/ x2 - 6x = 0 b/ ( 3x – 1)2 – ( x + 5)2 = 0
c/ 9x2 ( x- 1) = x – 1 d/ x2 – 4 = ( x – 2)2
e/ x + 3 – ( x + 3)2 =0 f/ x3 – 0,36x = 0
g/ 5x( x- 2018) – x + 2018 = 0 h/ x( x- 5) – 4x + 20 = 0
Tìm x, biết:a) 2-x 2
(
x
-
2
)
3
; b) 8
x
3
- 72x 0;c)
(
x
-
1
,
5
)
6
+
...
Đọc tiếp
Tìm x, biết:
a) 2-x = 2 ( x - 2 ) 3 ; b) 8 x 3 - 72x = 0;
c) ( x - 1 , 5 ) 6 + 2 ( 1 , 5 - x ) 2 = 0; d) 2 x 3 +3 x 2 +3 + 2x = 0;
e) x 3 - 4x- 14x(x - 2) = 0; g) x 2 (x + 1)- x(x + 1) + x(x - 1) = 0.
ai giải được bài mình xin tặng 2GP ạ
HELPP MEE : Giari pt
a) (x-3)(x-2)<0
b) (x+3)(x+4)(x2+2)\(\ge\) 0
c) \(\dfrac{x-1}{x-2}\) \(\ge\)0
d)\(\dfrac{x+3}{2-x}\)\(\ge\) 0
e) (x-3)(x-2)(x+1)<0
g) \(\dfrac{2}{x-1}\)<0
k) x2 +3x+2>0
m) x2+1<0
Bài 4: Tìm x: 1) x2 - 9x 0 2) x(x - 4) – x2 7 3) 3x + 2(x – 5) 5 4) 25x2 - 1 0 5) 3x(x - 2) - 5(x - 2) 0 6) 3x(x - 7) + 4(x – 7) 0 7) 4x2 – 9 0 8) 10x(x - 4) + 2x - 8 0 9) x(2x - 5) - 2x2 0 10) 2x2 – 4x 0 11) 2x(3 - 4x) + 3(4x - 3) 0 12) 2x (x – 5) – 2x2 3mọi người giúp mình vs chiều 1g mình thi rồi! cảm ơn!
Đọc tiếp
Bài 4: Tìm x:
1) x2 - 9x = 0 2) x(x - 4) – x2 = 7 3) 3x + 2(x – 5) = 5
4) 25x2 - 1 = 0 5) 3x(x - 2) - 5(x - 2) = 0 6) 3x(x - 7) + 4(x – 7) = 0
7) 4x2 – 9 = 0 8) 10x(x - 4) + 2x - 8 = 0 9) x(2x - 5) - 2x2 = 0
10) 2x2 – 4x = 0 11) 2x(3 - 4x) + 3(4x - 3) = 0 12) 2x (x – 5) – 2x2 = 3
mọi người giúp mình vs chiều 1g mình thi rồi! cảm ơn!