
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.


2: 12-10x=25-30x
=>20x=13
=>x=13/20
3: \(3\left(2x+3\right)-2\left(4x-5\right)=10x+21\)
=>6x+9-8x+10=10x+21
=>10x+21=-2x+19
=>12x=-2
=>x=-1/6
4: \(\Leftrightarrow25x-15-6x+12=11-5x\)
=>19x-3=11-5x
=>24x=14
=>x=7/12
5: \(\Leftrightarrow8-12x-5+10x=4-6x\)
=>4-6x=-2x+3
=>-4x=-1
=>x=1/4
6: \(\Leftrightarrow32x-24-6+9x=13-40x\)
=>41x-30=13-40x
=>81x=43
=>x=43/81
7: \(\Leftrightarrow10x-5+20x=5x-11\)
=>30x-5=5x-11
=>25x=-6
=>x=-6/25

1)8(4x-3)-3(2-3x)=13-40x
(32x-24)-(6-9x)=13-40x
32x-24-6+9x=13-40x
41x-30=13-40x
41x+40x=13+30
81x=43
x=43/81
Vậy x=43/81
2)10x-5(1-4x)=5x-11
10x-(5-20x)=5x-11
10x-5+20x=5x-11
30x-5=5x-11
30x-5x=5-11
25x=-6
x=-6/25
Vậy x=-6/25

a)\(x=\frac{2k-5}{4-3k},k\in\Z\)
b) \(x=\frac{m-5}{3-4m},m\in\Z\)
Câu a:
(4\(x\) + 5) ⋮ (3\(x\) + 2)
3(4\(x\) + 5) ⋮ (3\(x\) + 2)
[4(\(3x\) + 2) + 7] ⋮ (3\(x\) + 2)
7 ⋮ (3\(x\) + 2)
(3\(x\) + 2) ∈ Ư(7) = {-7; -1; 1; 7}
Lập bảng ta có:
3\(x+2\) | -7 | -1 | 1 | 7 |
\(x\) | -3 | -1 | -1/3 | 5/2 |
\(x\in Z\) | tm | tm | loại | loại |
Theo bảng trên ta có: \(x\in\) {-3; -1}
Vậy: \(x\) ∈ {-3; -1}

⇔(2 x ) 2+2.2 x .1+1 2=0 ... c ,(3 x −4) 2−14(3 x −4)(6+3 x )+49(3 x +6)=16 ... ⇔9 x 2−24 x +16−126 x 2−252 x +168 x +336+147 x +294=16.
https://olm.vn/hoi-dap/detail/192758180810.html

19 22 25 28 5(3x + 2) – 4(2x +3) x*(1 + 2x) 4(1 + x) – 3(2x-5) 4x–8(6) - X) 23/ ... 2x” – 4x + 3x – 6 = 2x” – X-6 (b) (x-3) = (x-3)(x-3) (c) (2x+y)(2x–y) = x* = x* – 3x ... (x - 6)” 7 (3x + 5)(x-6) 8 (8x + 2)(3x + 4) (4x – 1)(2x – 3) 10 (2x +5)* 11 (8x – 3)(2x + ... 27 (4x + 3y)(x + y) 28 (2x + 5)(5x – 2) (4x – 3y)(4x + y) 30 (7x + 2y)(3x + 4y) 24/ ...
\(a)=3x\cdot\left(2x-7-4x+5\right)=3x\cdot\left(-2x-2\right)=3x\cdot\left[-2\cdot\left(x+1\right)\right]\)

a) 17 + x = -5 + 2x
=> x - 2x = -5 - 17
=> -x = -22
=> x = 22
b) 15 - 3x = -22 - 4x
=> -3x + 4x = -22 - 15
=> x = -37
c) 47 - (4x + 5) = -(3x - 2)
=> 47 - 4x - 5 = -3x + 2
=> -4x + 3x = 2 - 47 + 5
=> -x = -40
=> x = 40
d) -58 + (3 - 7x) = 15 - 8x
=> -58 + 3 - 7x = 15 - 8x
=> -7x + 8x =15 + 58 - 3
=> x = 70
4x + 3x = 7014
(4+3)x=7014
7x=7014
x=7014:7=1002
4x + 3x = 7014
( 4 + 3 ) x = 7014
7x = 7014
x = 7014 : 7
x = 1002