(x2+9).(2x-4)=0
=>x2+9=0 hc 2x-4=0
TH1:x2+9=0=>x=-4,5
TH2:2x-4=0=>x=2
Vậy x = -4,5 hc 2
tick nha !!!
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a) (x-1).(x+2)=0
b) (x+4).(4-x)=0
c) (x+4)(-3x+9)=0
d) (2x-4)(x+3)=0
e) (x2-9).(2x+10)=0
g) (4-x).x2=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
tìm x , y thuộc Z biết :
a, 4.(x +1 ) - (3x-1) = 14
b, (x^2 - 9 ). (x +2 )=0
c,(x^2 + 9 ) . (2x - 4) = 0
d, xy + 2x - y = 2
tìm x , y thuộc Z biết ;
a, 4 .( x+1) - (3x - 1) = 14
b, (x^2 - 9 ). (x+ 2) =0
c, (x^2 +9) . (2x -4) =0
d, xy +2x -y =2
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
tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
Tìm x
1)7.(x-1) +2x.(x-1) =0
2)2x.(x-3)+9x-27=0
3)4.(x-1/2)+4.(5-x)=9/2
Tìm x, biết:
a) 3.| 9 - 2x| - 17= 16
b) 3 - 4. |5 - 6x| =7
c) |9 - 7x|= 5x - 3
d) 8x - |4x + 1| = x + 2
e)|2x - 3| - ( 2x - 3) = 0
g)| 4- x| + ( 4 - x ) =0
Tìm x
(2x-7)+17=6
12-2.(3-3x)=-2
-14+3.(-x+5)=-20
-90:5.(-3-2x)=6
(x+1).(x-3)=0
(2x-2).(x+4)=0
(22+4).(x+3)=0
(5-x).(6-2x)=0
3.(x+1)+5=x+8
-4.(2x+9)-(-8x+3)-(x+13)=0
1) Tìm x biết :
a) 2x + 5 = x - 7
b) |x| = |8|
c) | 2x - 1 | = | - 13 |
d) 5x + 4 = 3x - 6
e) 4 ( x - 1 ) = 2 ( x + 2 ) = 6
f) x2 - 8x = 0
g) 2x2 + 6x = 0
h) | x + 1 | = 5
i) x + 2 | bé hơn hoặc bằng 4
k) | x - 9 | = x - 9
l) 3x - 5 = 2x + 7
m) 4x - 9 = 3x +5
n) ( 5x - 10 ) ( 6x + 1 ) = 0