\(\Leftrightarrow3x-2=7\)
hay x=3
73x - 2 - 3. 73 = 73. 4
73x - 2 = 3 . 73 + 73. 4
73x - 2 = 73 . (3 + 4)
73x - 2 = 73 . 7
73x - 2 = 74
=> 3x - 2 = 4
<=> 3x = 6
<=> x = 2
KL: Vậy x = 2
Tìm x thuộc Z:
14) 24 ( 2x + 11)2 = 42
15) 73x - 2 - 3. 73 = 73. 4
bài 6: Tìm x thuộc Z
a) 2+3x= - 15 - 19
b) 9.x+1=73
c) 2x - 5 = - 17 + 12
d) 10 - x -5 = - 5 - 7 -11
e) (-9) . x + 3= (-2) . (-7)+ 16
10) x - [42 + (-28)] = -8
11) (7 - x) - (25 + 7)=- 25
12) (3x - 24). 73 = 2.74
13) ( x – 4)² = 25
14) 24( 2x + 11)² = 42
15) 73x-2 – 3.73 =73 . 4
Tìm STN x, biết
1) (x + 2) - 2 = 0 2) (x + 3) + 1 = 7
3) (3x - 4) + 4 = 12 4) (5x + 4) - 1 = 13
5) (4x - 8) - 3 = 5 6) 3 + (x - 5) = 7
7) 8 - (2x - 4) = 2 8) 7 + (5x + 2) = 14
9) 5 - (3x - 11) = 1 10) 16 - (8x + 2) = 6
Bài 6 . Tìm x biết: 1) 58 + 7x = 100 AI LM ĐC MÌNH CHO 20 XU
2) 101 +(36 – 4x) =105
3) 3x – 7 = 28
4) ( x – 12):12=12
5) x – 56 : 4= 16
6) (3.x-2 4 ).73=2.74
7) 71 – (33 + x) = 26
8) = 7 10) 4(x + 41) = 400
9) 45 – (x + 9):2 = 6
11) 2. (x + 7) – 25 = 13
13) 2(x- 51) = 2.23 + 20
15) 450 : (x – 19) = 50
17) 10 - (x – 3): 2 = 72 – 1 10
19) 2x + 2 – 2 x = 48
8) 140 : (x – 12) 5(x – 9) = 350
14) 2x – 49 = 5.32
16) 200 – (2x + 6) = 43
18) 135 – 5.(x + 4) = 35
20) (3x – 5)3 – 1 = 26
Tìm x thuộc N, biết: A) 3.[(2.x-1)2-4] - 142= 72.53: 175.
B) 2.3x+1 -410: 47=(75:73).(33-52)
Tìm x thuộc N, biết: A) 3.[(2.x-1)2-4] - 142= 72.53: 175.
B) 2.3x+1 -410: 47=(75:73).(33-52)
Tìm x biết:
a)58+7x=100
b)3x - 7=28
c)x - 56:4=16
d)101+(36-4x)=105
e) (x - 12 ) : 12 = 12
f) (3.x-24).73=2.74
i) (10+2x) .42011=42013
Bài 3: Tìm x e Z:
1) 71 – (33 + x)= 26
2) (x + 73) – 26 = 76
3) x - 7 = -5
4) -23 +x = - (- 25)
5) -5 < x ≤ 6
6) 140 : (x – 8) = 7
