tim x biết 55=317-x - 317
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\(43+\left(9-21\right)=317\left(x+317\right)\)
\(\Rightarrow317-\left(x+317\right)=43+\left(9-21\right)\)
\(\Rightarrow317-\left(x+317\right)=43+\left(-12\right)\)
\(\Rightarrow317-\left(x+317\right)=31\)
\(\Rightarrow x+317=317-31\)
\(\Rightarrow x+317=286\)
\(\Rightarrow x=286-317\)
\(\Rightarrow x=-31\)
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.
![](https://rs.olm.vn/images/avt/0.png?1311)
43 + ( 9 - 21 ) = 317 - ( x + 317 )
<=> 31 = 317 - x - 317
<=> 31 = -x
<=> x = -31
![](https://rs.olm.vn/images/avt/0.png?1311)
\(43+\left(9-21\right)=317-\left(x+317\right)\)
\(\Leftrightarrow\) \(43+9-21=317-x-317\)
\(\Leftrightarrow\) \(31=-x\) \(\Leftrightarrow x=-31\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(43+\left(9-21\right)=317-\left(x+317\right)\)
\(43+9-21=317-x-317\)
\(31=317-317-x\)
\(31=0-x\)
\(\Rightarrow x+0=-31\)
\(x=\left(-31\right)-0\)
\(x=-31\)
\(43+\left(9-21\right)=317-\left(x+317\right)\)
\(43+\left(-12\right)=317+x-317\)
\(31=317+x+\left(-317\right)\)
\(31=317+\left(-317\right)+x\)
\(31=0+x\)
\(31=x\)
\(\Leftrightarrow x=31\)
Vậy \(x=31\) là giá trị cần tìm
![](https://rs.olm.vn/images/avt/0.png?1311)
317 - (213 - x) = 137
213 - x = 317 - 137 = 180
x = 213 - 180
x = 33
![](https://rs.olm.vn/images/avt/0.png?1311)
x - 317 = 317 - 55
x - 317 = 262
x = 262 - 317
x = (-55)
T.I.C.K. GIÚP MK NHÉ!
55 = 317 - x - 317
55 - x = 317 - 317
55 - x = 0
x = 0 - 55
x = -55