634 : x = 317

x= 634 : 317 = 2

Vậy x=2

634 : x = 317

x = 634 : 317

x = 2

Vậy x = 2

Tk mk nha

634 : x = 317

         x = 634 : 317

         x  = 2

\(43+\left(9-21\right)=317\left(x+317\right)\)

\(\Rightarrow317-\left(x+317\right)=43+\left(9-21\right)\)

\(\Rightarrow317-\left(x+317\right)=43+\left(-12\right)\)

\(\Rightarrow317-\left(x+317\right)=31\)

\(\Rightarrow x+317=317-31\)

\(\Rightarrow x+317=286\)

\(\Rightarrow x=286-317\)

\(\Rightarrow x=-31\)

Vay x = -31

\(b.\left(15-x\right)+\left(x-12\right)=7-\left(-5+x\right)\)

\(\Rightarrow15-x+x-12=7+5+x\)

\(\Rightarrow15-12=12-x\)

\(\Rightarrow3=12-x\)

\(\Rightarrow12-x=3\)

\(\Rightarrow x=12-3\)

\(\Rightarrow x=9\)

Vay x = 9 

....

a) 43+(9-21) = 317-(x+317)

43+(-12) = 317-(x+317)

317-(x+317) = 31

x+317 = 317-31=286

x = 286-317=(-31)

Tạm thời câu b mình chưa nghĩ ra nha.

a) \(43+\left(9-21\right)=317-\left(x+317\right)\)

\(43+\left(-12\right)=317-\left(x+317\right)\)

   \(317-\left(x+317\right)=31\)

\(x+317=317-31=286\)

\(x=286-317=-31\)

b) \(\left(15-x\right)+\left(x-12\right)=7-\left(-5+x\right)\)

\(15-x+x-12=7+5-x\)

\(7+5-x=\left(15-12\right)+\left(-x+x\right)\)

\(7+5-x=3+0=3\)

\(5-x=3-7=-4\)

\(x=5-\left(-4\right)=5+4=9\)

a 43+(9-21)=317-(x-317)

43+(-10)=317-x-317

31=(317-317)-x

31=-x

x=-31

h minh nha

43 + ( 9 - 21 ) = 317 - ( x + 317 ) 

<=> 31 = 317 - x - 317

<=> 31 = -x

<=> x = -31

\(43+\left(9-21\right)=317-\left(x+317\right)\)

\(\Leftrightarrow\) \(43+9-21=317-x-317\)

\(\Leftrightarrow\) \(31=-x\) \(\Leftrightarrow x=-31\)

=3141,47

\(317.6,3+317.3,6+3,17\)

\(=317.6,3+317.3,6+317.0,01\)

\(=317\left(6,3+3,6+0,01\right)\)

\(=3179.9,9=3141,47\)

\(317x6,3+317x3,6+3,17=\)

\(317x6,3+317x3,6+317x0,01=\)

\(317x\left(6,3+3,6+0,01\right)\)\(=\)

\(317x10,01=\)\(3173,17\)

\(43+\left(9-21\right)=317-\left(x+317\right)\)

\(43+9-21=317-x-317\)

\(31=317-317-x\)

\(31=0-x\)

\(\Rightarrow x+0=-31\)

\(x=\left(-31\right)-0\)

\(x=-31\)

\(43+\left(9-21\right)=317-\left(x+317\right)\)

\(43+\left(-12\right)=317+x-317\)

\(31=317+x+\left(-317\right)\)

\(31=317+\left(-317\right)+x\)

\(31=0+x\)

\(31=x\)

\(\Leftrightarrow x=31\)

Vậy \(x=31\) là giá trị cần tìm

\(43\) \(+\) \(\left(9-21\right)\) \(=\) \(317\) \(-\) \(\left(x+317\right)\)

\(43\) \(+\) \(\left(9-21\right)\) \(=\) \(317\) \(-\) \(x-317\)

\(43+\left(-12\right)\) \(=\) \(317-317-x\)

\(31\) \(=\) \(0-x\)

\(0+x=31\)

\(x\) \(=\) \(31-0\)

\(x\) \(=\) \(31\)

317 - (213 - x) = 137

213 - x = 317 - 137 = 180

x = 213 - 180 

x = 33

317-(213-x)=137

213-x        =317-137

213-x        =180

      x        =213-180

      x        =33

317-(213-x)=137

317-213+x=137

104+x=137

x=137-104

x=33

x-425=914-317

x-425=597

x       =1022

⇒ x - 425 =597

⇒ x           = 1022

x-425 = 914-317

x-425 = 597

x = 597+425

x = 1022

Vậy x = 1022