a)3x(x-2006)-x+2006=0
<=>3x(x-2006)-(x-2006)=0
<=>(x-2006)(3x-1)=0
<=>x-2006=0 or 3x-1=0
<=>x=2006 or x=1/3
b)x=9x3
<=>9x3-x=0
<=>x(9x2-1)=0
<=>x(3x-1)(3x+1)=0
<=>x=0 or 3x-1=0 or 3x+1=0
<=>x=0 or x=1/3 or x=-1/3
B1 CMR biểu thức sau luôn dương với mọi x
A=x^2-6x+15
B=4x^2+4x+7
B2 CMR biểu thức sau luôn âm với mọi x
A=-9x^2+6x-2021
B=-2x^2+2x-7
B3 Tìm x
A) (x-2)^2 - (3-4x)^2 +15x^2=0
B) (x-3)(x^2+3x+9)-x(x+2)(2-x)=0
Tim x
a, x\(^2\)-7x+12=0
b, x(x-4)-3(4-x)=0
Tìm x
a, 2x.(x-3)+3(x-3)=0
b, x(3x-1)-5(1-3x)=0
Tìm x biết :
a/ ( x +1 )^2 - 3 ( x + 1 ) = 0
b/ 2 ( 3x - 2 )^2 = 9x^2 - 4
Bài 3 tìm x
a) (x-1)(x-5) 3=0
b) 3x^2+7x=10
TÌM X
a. 3.(x^2-x+2)-x.(2+3x)=0
b. (x-1)^2 + (x-1)(x+2)=0
c. 2x^3 +3x^2+2x+3=0
d. 2x^2+x=6
tìm x
a) 3.(x-3)-4x+12=0
b)(x+2)^2-(x+2).(x-2) =0
c)x^3+3x=3x^2+1
d)2/3x.(x^2-4)=0
e)(2x-3)^2-(+5)^2=0
x^2006 +a chia het cho x+1 tim a
Tìm x
a) 4x(x-2) + x-2 = 0
b) (3x-1)^2 - 9 = 0
c) x^3 - 8 + (x-2)(x+1) = 0
