( x - 1 )= 9 (x + 1)2
<=> (x - 1)2 - 9 (x + 1)2 = 0
<=> x2 - 2x + 1 - 9x2 - 18x - 9 = 0
<=> -8x2 - 20x - 8 = 0
<=> -4(2x2 + 5x + 2) = 0
<=> -4 (2x2 + 4x + x + 2) = 0
<=> -4(x + 2)(2x + 1) = 0
<=> x = -2 ; -0,5
Tổng tất cả các nghiệm của phương trình:
là
Tìm x
a)(2x+1)2-4(x+2)2 =9
b)(3x-1)2 +2(x+3)2 +11(x+1)(1-x)=6
c)(x+1)3 - x2 (x+3)=2
d)(x-2)3 -x(x+1)(x-1)+6x2 =5
e)(x-3)(x2 +3x +9)-x(x+4)(x-4)=5
g)(x-2)3 -(x+5)(x2 -5x+25)+6x2 =11
Tìm x
b) (x-5) (x-4) - (x+1)(x-2)=7
c) (3x-4)(x-2)=3x(x-9)-3
d)(x-3)(x^2+3x+9)+x(5-x^2)=6x
e) (3x-5)(x+1)-(3x-1)(x+1)=x-4
14. Giải các phương trình:
a, 2x+1/9+2x+2/8+2x+3/7+...+2x+8/2+2x+9/1+9=0
b, x-1/2015+x-2/2014+x-3/2013+... +x-2014/2+x=4030
a) x-1/x+1/x+1=2x-1/x^2+x
b) 5/x-3-2x-3/x+3=2x(1-x)/x^2-9
Tìm x biết : 6(x+2)(x-3)-3(x-2)^2-3(x-1)(x+1)=1
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
(x-1)(x^2+x+1)+x(x+2)(2-x)=5
(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
Tìm x biết : 6(x+2)(x-3)-3(x-2)^2-3(x-1)(x+1)=1
3(x+2)^2+(2x-1)^2-7(x+3)(x-3)=36
(x-1)(x^2+x+1)+x(x+2)(2-x)=5
(x-1)^3-(x+3)(x^2-3x+9)+3(x^2-4)=2
Tìm x (x+2)(x2-2x-4)-x(x2+2)=15. (x-2)3-(x-3)(x2+3x+9)+6(x+1)2+49. 25x2-9=0. (x+4)2-(x+1)(x-1)=16. (2x+1)2+(x+3)2-5(x-7)(x-7)=0. (x+1)(x+2)(x+5)(x+7)=24. Giúp mình làm câu này
1,Giải PT
a,\(\frac{y-1}{y-2}-\frac{5}{y+2}=\frac{12}{y^2-4}+1\)
b,\(\frac{1}{4z^2-12z+9}-\frac{3}{9-4z^2}=\frac{4}{4z^2+12z+9}\)
c,\(\frac{x+5}{x-1}=\frac{x+1}{x-3}-\frac{8}{x^2-4x+3}\)
Tìm x
a)(2x+1)2-4(x+2)2 =9
b)(3x-1)2 +2(x+3)2 +11(x+1)(1-x)=6
c)(x+1)3 - x2 (x+3)=2
d)(x-2)3 -x(x+1)(x-1)+6x2 =5
e)(x-3)(x2 +3x +9)-x(x+4)(x-4)=5
g)(x-2)3 -(x+5)(x2 -5x+25)+6x2 =11
