![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7x.\left(2+x\right)-7x.\left(x+3\right)=14\)
\(7x.\left(2+x-x-3\right)=14\)
\(7x.\left(-1\right)=14\)
\(7x=14:\left(-1\right)\)
\(7x=-14\)
\(x=\left(-14\right):7\)
\(x=-2\)
7x.( 2 + x ) - 7x( x + 3 ) = 14
<=> 7x( 2 + x - x - 3 ) = 14
<=> 7x.(-1) = 14
<=> -7x = 14
<=> x = -2
![](https://rs.olm.vn/images/avt/0.png?1311)
7x(2+x )- 7x (x+3) = 14
<=> 14x + 7x2 - 7x2 - 21x = 14
<=> -7x = 14
<=> x = -2
![](https://rs.olm.vn/images/avt/0.png?1311)
7x.(2+x)-7x.(x+3)=14
7x.[(2+x)-(3+x)]=14
7x.[2+x-3-x]=14
7x.(-1) =14
7x =14:(-1)
7x =-14
x =-14:7
x =-2
Chúc bn học tốt
\(7x\left(2+x\right)-7x\left(x+3\right)=14\)
\(\Leftrightarrow14x+7x^2-7x^2-21x=14\)
\(\Leftrightarrow-7x=14\)\(\Leftrightarrow x=-2\)
Vậy \(x=-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7x.(2+x)-7x.(x+3)=14
7x.(2+x-x-3)=14
7x.(-1)=14
7x=14:(-1)
7x=-14
x=-14:7
x=2
Vậy x=2
tk nha!
![](https://rs.olm.vn/images/avt/0.png?1311)
+ -2X-12+6X-60=8
<=>4X=80]
<=> X = 20
V.....
+ -8X-36 +8X -3 - X - 13 =0
<=> -X = 52
<=> X = -52
V.....
+ 14X +7\(X^2\)-7\(X^2\)-21X=14
<=> -7X =14
<=> X= -2
V .......
![](https://rs.olm.vn/images/avt/0.png?1311)
a, =>-2x+12+6x-60=8
=>4x+48=8
=>4x=56
=>x=14
b,=>-8x-36-8x-3-x-13=0
=>-17x-52=0
=>-17x=52
=>x=-52/17
c,=>14x+7x^2-7x^2-21x=14
=>-7x=14
=>x=-2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) -4.(2x+9)-(-8x+3)-(x+13)=0
-8-36+8x-3-x-13=0
-x-52=0
x=-52
b) 7x.(2+x)-7x.(x+3)=14
7x.(2+x-x-3)=14
7x.(-1)=14
7x=14:(-1)
7x=-14
x=(-14):7
x=-2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\)
\(x+\left(-17\right)=-24\)
\(\Leftrightarrow x=-24+17=-7\)
\(b.\)
\(\dfrac{3}{7}x-\dfrac{1}{2}=\dfrac{3}{14}\)
\(\Leftrightarrow\dfrac{3}{7}x=\dfrac{3}{14}-\dfrac{1}{2}=\dfrac{3}{14}-\dfrac{7}{14}=-\dfrac{2}{7}\)
\(\Leftrightarrow x=-\dfrac{2}{7}:\dfrac{3}{7}=-\dfrac{2}{3}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(7x\left(2+x\right)-7x\left(x+3\right)=14\)
\(\Leftrightarrow14x+7x^2-7x^2-21x=14\)
\(\Leftrightarrow\left(14x-21x\right)+\left(7x^2-7x^2\right)=14\)
\(\Leftrightarrow-7x+0=14\)
\(\Leftrightarrow-7x=14\)
\(\Leftrightarrow x=14\div\left(-7\right)\)
\(\Leftrightarrow x=-2\)
Vậy x = - 2
7x.(2+x)-7x.(x+3)=14
7x.[(2+x)-(x+3)]=14
7x.[x+2-x-3]=14
7x.(-1) =14
7x =14:(-1)
7x =-14
x =-14:7
x =-2
Chúc bn học tốt
\(7x\cdot\left(2+x\right)-7x\cdot\left(x+3\right)=14\)
\(7x\cdot\left(2+x-x-3\right)=14\)
\(7x\cdot\left(-1\right)=14\)
\(7x=-14\)
\(x=-2\)