43 + (9 – 21) = 317 – (x + 317)
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\(43+\left(9-21\right)=317-\left(x+317\right)\)
\(\Leftrightarrow\) \(43+9-21=317-x-317\)
\(\Leftrightarrow\) \(31=-x\) \(\Leftrightarrow x=-31\)
43+(9−21)=317−(x+317)43+(9−21)=317−(x+317)
⇔⇔ 43+9−21=317−x−31743+9−21=317−x−317
⇔⇔ 31=−x31=−x ⇔x=−31
\(43+\left(9-21\right)=317-\left(x+317\right)\)
\(43+9-21=317-x-317\)
\(31=317-317-x\)
\(31=0-x\)
\(\Rightarrow x+0=-31\)
\(x=\left(-31\right)-0\)
\(x=-31\)
\(43+\left(9-21\right)=317-\left(x+317\right)\)
\(43+\left(-12\right)=317+x-317\)
\(31=317+x+\left(-317\right)\)
\(31=317+\left(-317\right)+x\)
\(31=0+x\)
\(31=x\)
\(\Leftrightarrow x=31\)
Vậy \(x=31\) là giá trị cần tìm
\(43+\left(9-21\right)=317\left(x+317\right)\)
\(\Rightarrow317-\left(x+317\right)=43+\left(9-21\right)\)
\(\Rightarrow317-\left(x+317\right)=43+\left(-12\right)\)
\(\Rightarrow317-\left(x+317\right)=31\)
\(\Rightarrow x+317=317-31\)
\(\Rightarrow x+317=286\)
\(\Rightarrow x=286-317\)
\(\Rightarrow x=-31\)
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.
Tìm x
\(\text{a.-(-3-x+8)-(-3+5)=|5-8| }\)
\(3+x-8+3-5=\)\(\left|-3\right|\)
\(3+x-8+3-5=\)\(3\)
\(x=\)\(\text{3+5-3+8-3}\)
\(\text{x=10}\)
B.\(\text{43+(9-21)=317-(x+317)}\)
\(43+9-21\)\(=317-x-317\)
\(50-21=\left(317-317\right)\)\(-x\)
\(29=0-x\)
\(29=-x\)
\(\Rightarrow x=-29\)
c,3(x-2)-2(x-4)=-12-2
3x -6 -2x -8= -12
(3x-2x) - (6+8) =-14
x-14=-14
x=-14+14
x=0
a,x+(-45)=(-62)+17
<=>x=(-62)+17+45
<=>x=0
b,x+29=\(|-43|\)-+(-43)
<=>x=43-43-29
<=>x=-29
c,43+(9-21)=317-(x+317)
<=>31=317-x-317
<=>31=-x
<=>-31=x
d, (15-x)+(x-12)=7-(-5-x)
<=>15-x+x-12=7+5+x
<=>3=12+x
<=>-9=x
e, x-{57-[42+(-23-x)]}=13-{47+[25-(32-x)]}
<=>x-57+42-23-x=13-47-25+32-x
<=>76=-27-x
<=>103=-x
<=>-103=x
f,\(|x|+|-4|=7\)
<=>\(|x|\)+4=7
<=>\(|x|\)=3
<=>x=3 hoặc x=-3
43 + ( 9 - 21 ) = 317 - ( x + 317 )
<=> 31 = 317 - x - 317
<=> 31 = -x
<=> x = -31