( | x| + 2) . ( 6 - 2 . | x|) = 0
=> 6-2| x|=0
6=2| x|
6:2=| x|
3=| x|
±3=x
Vậy x=±3
=>hoặc /x/ +2=0 =>/x/=-2 (vô lí)
hoặc 6- 2./x/=0 =>2./x/=6 =>/x/=3 =>x=+(-)3
Vậy x=3 hoặc x=-3
x(x+1)<0
(x-6)(x+4)<0
(x+6)(2x+4)>0
(x^2+1)(x-9)>0
(x^2-7)(x^2-12)<0
(x^2-9)(x^2-4)<0
(-20.12).(x+3)=0
(2+x).(7+x)=0
104x.(6-x)=0
x^2-3x=0
|2x|-|x-14| 61 với >14
|6-x|.(-8)=-16
A=5.x^3.|x-1|+15 với x=2
B-(x-1)(x+2) với |x|=3
C=(3x-4)(x-6) với (x-1)(x+2)=0
1,x=3x2
2,(x+5)(x-3)-(x-30)=0
3,(2x-6)(x+4)+2(2x-6)=0
4,(2x-5)(x+9)+6x-15=0
3,(2x-5)(x+6)+8x-20=0
(x-2).(2x-6)=0
(3x+9).(1-3x)=0
(x2+1).(81-x2) =0
5-|2x-1| = (-6)
|2-x| +2 =x
|x+1|=|x-3|
Tìm x, y thuộc Z , biết :
a) ( 2x - 10 ) ^ 2 + ( 4 - 2y ) ^ 2 = 0
b) ( x - 2 ) . ( x + 3 ) > 0
c) ( x - 2 ) . ( x + 3 ) < 0
d) ( 2x - 6 ) . ( x - 5 ) > 0
e) ( 2x - 6 ) . ( x - 5 ) <0
f) ( x + 4 ) . ( 2 - x ) < 0
g) ( x + 4 ) . ( 2 - x ) > 0
h) ( x ^ 2 + 3 ) . ( 5x + 20 ) < 0
1.Tìm số nguyên x biết
|x-3|=|x+7|
|3x+2|+|x-8|
|x+3|+|y-8|=0
|x-5|+|x-3|=0
(x-2)(x+6)=0
x(3x+6)=0
(2x-4)(x3-1)=0
(x-2)(x+7)>0
(x+3)(x+5)>0
(x+2)(x-5)<0
Tìm x thuộc Z:
a, 3(x-2) + 5(x-6) - 8(x-11) = 98
b, (|x| +2).(6-2|x|) = 0
c, (x2-13).(x2-17) <0
Tìm x
( x - 140) : 7 = 3^3 - 2^3 × 3
X - 6 :2 -( 48 -24 ) :2 :6 -3 = 0
X + 5×2 -( 32 + 16 ×3 :6 -15 ) =0
Tìm x,y thuộc Z:
a) 3. (2 - x)+5(x - 6) = -98
b) (x+7) .(8-x) =0
c) (x2+1) .(49-x2) =0
d) (|x|+2) .(6-2|x|) =0
e) (x-2) .(7-x)>0
g) (x2-13) .(x2-17)<0
h) x .y= -28
i) (2x-1) .(4y-2)= -42
Bài 1: Tìm x
1/(2.x-5)+17=6
2/10-2.(4-3x)=-4
3/-12+3.(-x+7)=-18
4/24:(3.x-2)=-3
5/-45:5.(-3-2.x)=3
6/x.(x+7)=0
7/(x+12).(x-3)=0
8/(-x+5).(3-x)=0
9/x.(2+x).(7-x)=0
10/(x-1).(x+2).(-x-3)=0
