(x+3).(2x-18)=0
=>x+3=0 hoặc 2x-18 =0
+)x+3=0
x=-3
+)2x-18=0
2x =18
x =9
Vậy x \(\in\)\(_{\left\{-3;9\right\}}\)
(x+3).(2x-18)=0
=>x+3=0 hoặc 2x-18 =0
+)x+3=0
x=-3
+)2x-18=0
2x =18
x =9
Vậy x \(\in\)\(_{\left\{-3;9\right\}}\)
Câu 1:
a) -2x-(x-17)=34-(-x+25)
b) 17x-(-16x-27)=2x+43
c) -2x-3(x-17)=34-2(-x+25)
d) 17x+3(-16x-37)=2x+43-4x
e) 3x-32>-5x+1
f)15+4x<2x-145
g)-3(2x+5)-16<-4(3-2x)
h) -2x+15<3x-7<19-x
i)x+(x+1)+(x+2)+(x+3)+....+13+14=14
j)25+24+23+...+x+(x-2)+(x-3)=25
Câu 2:
a) (x-3).(y+5)=-17
b) (x+1).(xy-2)=11
c) xy-7x+y=-22
d) xy-3x+y=-20
Tìm x :
1) (2x - 5 ) + 17 = 6
2) 10 - 2(4 - 3x) = -4
3) -12 + 3(-x + 7) = -18
4) 24 : (3x - 2) = -3
5) -45 : 5 . (-3 - 2x) = 3
Bài2:Tìm x biết
a.1/3+2/3:x=-7
b.1/3x+2/5(x-1)=0
c.(2x-3)(6-2x)=0
d.x:3/4+1/4=-2/3
e.-2/3-1/3(2x-5)=3/2
f.2 l1/2x-1/3l-3/2=1/4
g.3/4-2.l2x-2/3l=2
h.(-0,6x-1/2).3/4-(-1)=1/3
i.(3x-1)(-1/2x+5)=0
j.1/4+1/3:(2x-1)=-5
k.(2x+3/5)2-9/25=0
l.3(3x-1/2)3+1/9=0
m.-5(x+1/5)-1/2(x-2/3)=3/2x-5/6
n.3(x-1/2)-5(x+3/5)=-x+1/5
a,2/3x-3/2x=5/12
b,2/5+3/5×(3x-3×7)=-53/10
c,7/9:(2+3/4x)+5/3=23/27
d,-2/3×x+1/5=3/10
e,|x|-3/4=5/3
Giúp em với ạ
tìm x biết
a) 2x-3/3+-3/2=5-3x/6-1/2
b)(3x-1/2) . (3-1/2x).(1+3/4:x)= 0
a. 3x - 7= 2x + 5 b. |3x - 2| = 7 c. 4 - |x-2| = -3 d. |2x - 3| = x-1 e. |3x + 1| = x+3
Tìm z thuộc Z
a) 15 - 3(x-1) = 15 + (7-2x)
b) (48 - |x+1|) (x2 - 25) = 0
c) (|x+3| + 7) (x3 - 27) = 0
d) (2x - 4) (3x + 6) (x+10) < 0
e) (x-1)+(x+1)+(x+2)+(x+3) + ..... + 101 = 200
2. So sánh: a2 và 2a
Tìm x:
a. 3x - 7= 2x + 5 b. |3x - 2| = 7 c. 4 - |x-2| = -3 d. |2x - 3| = x-1 e. |3x + 1| = x+3
Tìm x, biết:
a) -16 + 23 + x = -16
b) 2x - 35 = 15
c) 3x + 17 = 12
d) | 3 - 1 | = 0
e) -13 . | x | = -26