Tìm x :
x + 12 = 24 - 5
Tìm x thuộc Z
/ x / + / x-5/ = 0
/ 2x + 7 / + / x - 5 / = - 12
/ x - 12 / + x - 12 = 0
/ - x - 7 / = 24
/ 4 - x / = 21
Tìm x biết:
a, (x + 15)÷8 = 7
b, (x - 23)÷8 = 12
c, 24 = (x + 5)÷5
d, (x - 8)÷7 = 11
Tìm số nguyên x, biết:
a) 2 x + 12 = − 32.
b) − 3 x − 23 = − 17.
c) 2 ( x − 3 ) + ( − 6 ) = − 24.
d) x − 12 = − 5.
Bài 1:Tìm x để có các phân số bằng nhau:
2/3 =12/x , 24/36 = x/12 , 14/56 = 1/x ,
x/125 = 2/5
a: 2/3=12/x
=>12/x=2/3
hay x=18
b: =>x/12=2/3
hay x=8
c: =>1/x=1/4
hay x=4
d: =>x/125=2/5
nên x=50
a, \(\dfrac{12}{18}=\dfrac{12}{x}\Rightarrow x=18\)
b, \(\dfrac{24}{36}=\dfrac{3x}{36}\Rightarrow3x=24\Leftrightarrow x=8\)
c, \(\dfrac{14}{56}=\dfrac{14}{14x}\Rightarrow14x=56\Leftrightarrow x=4\)
d, \(\dfrac{x}{125}=\dfrac{50}{125}\Rightarrow x=50\)
tìm x biết:
a)-12(x-5)+7(3-x)=5
b)30(x+2)-6(x-5)-24=100
a, => -12x+60+21-7x=5
=> 71-19x=5
=> 19x = 71-5 = 66
=> x = 66 : 19 = 4
b, => 30x+60-6x+30-24=100
=> 24x+76 = 100
=> 24x = 100-76 = 24
=> x = 24 : 24 = 1
Tk mk nha
a, -12x-(-60)+21-7x=5
-19x+81=5
-19x=5-81
-19x=-76
x=-4
b, 30(x+2)-6(x-5)-24=100
30x+60-6x+30-24=100
36x+76=100
36x=34
x=34/36
Tìm x ∈ N, biết:
⦁ 2.(x + 4) + 5 = 65 b) (x – 5)2 = 16
c) x ⋮ 12 và 24 < x < 67 d) 5x.3 – 75 = 0
a) 2.(x+4)+5=65
2.(x+4)=65-5
2.(x+4)=60
x+4=60:2
x+4=30
x=30-4=26
Tìm x biết
a) 2.(x-5) = -24
b) 2. (x-5) -7= 13
c) 5.(3-x)+2. (x-7) = -14
d) 12. (x-5)+ 7. (3-x) = 5
e) 30. (x+2) - 6.(x-5) -24.x = 160
Tìm x :
a, -12 ( x - 5 ) + 7 ( 3 - x ) = 5
b, 30 ( x + 2 ) - 6 ( x - 5 ) - 24 . x =100
a. -12.(x-5)+7.(3-x)=5
=> -12x+60+21-7x=5
=> -19x+81=5
=> -19x=5-81
=> -19x=-76
=> x=(-76):(-19)
=> x=4
b. 30.(x+2)-6.(x-5)-24.x=100
=> 30x+60-6x+30-24x=100
=> (30x-6x-24x)+(60+30)=100
=> 0x+90=100
=> 0x=100-90
=> 0x=10 (vô lí)
=> không tồn tại x.
Tìm x, biết:
a) (x - 3.5).12 = 0;
b) 35. (x - 10) = 35;
c) ( x - 5): 3 + 3 = 24
d) ( x - 4) : 3 - 2 = 100
c) 25.(2.x - 4).12 = 0
d) (x - 4) : 6 - 5 = 10