a: =>x(x+28)=0
=>x=0 hoặc x=-28
b: =>x+9=0
=>x=-9
c: =>2x=-16
=>x=-8
a: =>x(x+28)=0
=>x=0 hoặc x=-28
b: =>x+9=0
=>x=-9
c: =>2x=-16
=>x=-8
1) (3x-6)(x+5)+4(x-2)=0
2) 3(x-5)(2x+9)+3x-15=0
3) (x2-16)(12-4x)=0
4) (9-x2)(4x-8)=0
5) (8-x3)(5x-125)=0
6) 4x=8
Tìm x,y∈Z,biết:
Tìm x,y∈Z,biết:
18*) (x-6)(3x-9)>0
19*) -2x(x+5)<0
20*) (2x-1)(6-x) >0
21*) (2-x)(x+7) <0
22*) |x+3|≤2
23*) (x + 3)(x2 + 2) > 0
24*) (x - 2)(-9 - x2 ) < 0
25*) |x + 25| + |5 - y|=0
26*) |x - 40 | + |x - y + 10 | lớn hơn hoặc bằng 0
27*) (x – 3)(3y + 2) = 7
28*) 5xy – 5x + y = 5
Tìm x biết:
a, (x+1)+(x+2)+...+(x+199)=0
b, (x=30)+(x-29)+(x-28)=11
c, x+(x-1)+(x-2)+...+(x-100)=0
d, 123-3.(x+4)=23
e, [(14x+26).3+55] : 5 =35
f, 720:[41-(2x-5)]= 23.5
g, (2x-4).(48-12x)2=0
h, (3-x).(4-2x).(x+10)=0
i, |x-7|+13=25
k, |x-3|-16=-4
l, 26-|x+9|=-13
Giúp mk nha!
tìm x thuộc Z bt
a, 5-(10x)=-7
b,(x-5).(2x+8)=0
c, 2x-9=-8+9
d,|x-9|.(-8)=-16
tìm x thuộc Z bt
5-(10x)= -7
(x-50.(2x+8)=0
2x-9=-8+9
|x-9|.(-8)=-16
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
a,35-2(x+7)=4x-13
b,25-x2=16
c,(3-x).(16-x2)=16
d,(x-1).(121+x2)=0
e,3.(x-7)=-x.(x+7)
f,(|x|-1).(9-x2)=0
g,x2-3x=0
h,x.(x-6)-3x+18=0
i,(x-5)2-(2x-6)=0
k,4x2-2x-2x+1=0
Bài 2 (1,5 điểm): Tìm x
a) 9(x + 28) = 0 b) 720 : [41 – (2x – 5)] = 23.5
/x-5/=0
/3x-9/=0
(x+7).(4x-16)=0
(x+5).(x+10)=0
A) 78-2x=42
B)6x+39=75
C) 2^3.x+ 2.x=25.2^2
D) 21+7x = 56
E) 5x +2x = 6^2-5^0
F)15x + 3x = 450 : 2+9
G) 6x+x=5^11: 5^9+3^1
H) 5x + 3x=3^11: 3^8.4+12
i) 2^3.x + 2^2.x =136-2^20 : 2^16
j) 7x -x= 5^21: 5^19+3.2^2
k) 7x - 2x= 6^17: 6^15 + 44 :11
l) 0: x =0 m) 3^x=27 n) 4^x= 64
o) 2^x = 32 p) 9^x-1=81 q) x^4=16
r) 3^x :3^
p) 9^x-1=81
q) x^4=165=1