x-43=(57-x)-50

x-43=57-x-50

x+x =57-50+43

2x   =50

   x  =50:2

   x  =25

sao ko đăng cùng 1 lúc đi

\(x-43=\left(57-x\right)-50\)

\(\Leftrightarrow x-43=57-x-50\)

\(\Leftrightarrow x-43=7-x\)

\(\Leftrightarrow2x=50\)

\(\Leftrightarrow x=25\)

\(x-43=\left(57+2x\right)-50\)

\(x-2x=57-50+43\)

\(-x=50\)

\(x=-50\)

x-43=57+2x-50

=>x=-50

=> x-43 = 57+2x-50

=> x-43 = 2x+7

=> 2x = x-43-7 = x-50

=> 50 = x-2x = -x

=> x = 50 : (-1) = -50

Vậy x = -50

Tk mk nha

\(\dfrac{x+35}{65}+\dfrac{x+39}{61}=\dfrac{x+43}{57}+\dfrac{x+47}{53}\)

\(\Leftrightarrow\dfrac{x+35}{65}+1+\dfrac{x+39}{61}+1=\dfrac{x+43}{57}+1+\dfrac{x+47}{53}+1\)

\(\Leftrightarrow\dfrac{x+100}{65}+\dfrac{x+100}{61}-\dfrac{x+100}{57}-\dfrac{x+100}{53}=0\)

\(\Leftrightarrow\left(x+100\right)\left(\dfrac{1}{65}+\dfrac{1}{61}-\dfrac{1}{57}-\dfrac{1}{53}\ne0\right)=0\Leftrightarrow x=-100\)

Ta có:

\(\dfrac{x+35}{65}+\dfrac{x+39}{61}=\dfrac{x+43}{57}+\dfrac{x+47}{53}\\ \Rightarrow\left(\dfrac{x+35}{65}+1\right)+\left(\dfrac{x+39}{61}+1\right)=\left(\dfrac{x+43}{57}+1\right)+\left(\dfrac{x+47}{53}+1\right)\\ \Rightarrow\dfrac{x+100}{53}+\dfrac{x+100}{61}=\dfrac{x+100}{57}+\dfrac{x+100}{53}\\ \Rightarrow\left(x+100\right)\left(\dfrac{1}{65}+\dfrac{1}{61}-\dfrac{1}{57}-\dfrac{1}{53}\right)=0\)

Ta thấy:

\(\dfrac{1}{65}< \dfrac{1}{57}\\ \dfrac{1}{61}< \dfrac{1}{53}\\ \Rightarrow\left(\dfrac{1}{65}+\dfrac{1}{62}\right)-\left(\dfrac{1}{57}+\dfrac{1}{53}\right)< 0\)

Hay \(\dfrac{1}{65}+\dfrac{1}{62}-\dfrac{1}{57}-\dfrac{1}{53}\ne0\)

\(\Rightarrow x+100=0\\ \Rightarrow x=0-100\\ \Rightarrow x=-100\)

 Vậy \(x=-100\)

Ta có: \(\dfrac{x+35}{65}+\dfrac{x+39}{61}=\dfrac{x+43}{57}+\dfrac{x+47}{53}\)

\(\Leftrightarrow\dfrac{x+100}{65}+\dfrac{x+100}{61}-\dfrac{x+100}{57}-\dfrac{x+100}{53}=0\)

\(\Leftrightarrow x+100=0\)

hay x=-100

<=> x - 43 = 57 - x  - 50

<=> x - 43 = 57 - 50 - x

<=> x - 43 = 7 - x

<=> x + x = 7 + 43

<=> 2x = 50

=> x = 25

Vậy x = -18

x-43=(57-x)-50

=>x-43=57-x-50

=>x-43=7-x

=>x+x=7+43

=>2x=50

=>x=50:2

=>x=25

x-43= (57-x)-50

x-43-(57-x)=-50

x-43 -57 +x =-50

-100 +2x=-50

2x= -50 +100

2x=-50

x= -50 : 2

x= -25

Ta có: \(x-43=\left(57-x\right)-50\)

\(\Leftrightarrow x-43=57-x-50\)

\(\Leftrightarrow x-43-57+x+50=0\)

\(\Leftrightarrow2x-50=0\)

\(\Leftrightarrow2x=50\)

\(\Leftrightarrow x=25\)

Vậy: x=25

\(x-43=\left(57-x\right)-50\)

\(x-43=57-x-50\)

\(x+x=57-50+43\)

\(2x=50\)

\(\Leftrightarrow x=25\)

x - 43 = ( 57 - x ) - 50

x - 43 = 57 - x - 50

x + x = 57 - 50 + 43

x + x = 50

2x = 50

x = 25

Vậy x = 25

\(x-43=\left(57-x\right)-50\)

\(\Rightarrow x-43=57-x-50\)

\(\Rightarrow x+x=57-50+43\)

\(\Rightarrow2x=50\)

\(\Rightarrow x=25\)

Vậy x = 25

<=>x-43=(57-50)-x

<=>x-43=7-x

<=>x+x=43+7

<=>2x=50

=>x=25

Vậy x =25

\(x-43=\left(57-x\right)-50\)

\(x-43=57-x-50\)

\(x-43=7-x\)

\(x+x=7+43\)

\(2x=50\)

\(x=25\)

Bạn xem lời giải của mình nhé:

Giải:

\(x-43=57-x-50\\ x-43=\left(57-50\right)-x\\ x+x=7+43\\ 2x=50\\ x=50:2\\ x=25\)

Chúc bạn học tốt!

\(x-43=57-x-50\)

\(x+x=57-50+43\)

\(2x=50\)

\(x=\frac{50}{2}\)

\(x=25\)

Chúc bạn học tốt

x-43=57-x-50
x-43 = 57-x-50 
2x    =     43+7 
2x    = 50 
x      = 50 : 2 
x      =25 

Vậy x = 25