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-26-(x-7)=0 \(\Rightarrow\chi-7=-26\)
\(\Rightarrow\chi=-26+7\)
\(\Rightarrow\chi=-19\)
HTDT
\(5\left(x-7\right)+2018^0=26\)
\(5x-35+1=26\)
\(5x-35=25\)
\(5x=60\)
\(x=12\)
\(5\left(x-7\right)+2018^0=26\)
\(\Rightarrow\left(5x-35\right)+1=26\)
\(\Rightarrow5x-35=25\)
\(\Rightarrow5x=60\)
\(\Rightarrow x=12\)
Vậy x = 12
a/ \(x\left(x+7\right)=0\) \(\Rightarrow\left[\begin{matrix}x=0\\x+7=0\end{matrix}\right.\) \(\Rightarrow\left[\begin{matrix}x=0\\x=-7\end{matrix}\right.\)
b/ \(\left(-x+5\right)\left(3-x\right)=0\) \(\Rightarrow\left[\begin{matrix}-x+5=0\\3-x=0\end{matrix}\right.\) \(\Rightarrow\left[\begin{matrix}x=5\\x=3\end{matrix}\right.\)
c/ \(\left|x-1\right|=3\) \(\Rightarrow\left[\begin{matrix}x-1=3\\1-x=3\end{matrix}\right.\) \(\Rightarrow\left[\begin{matrix}x=4\\x=-2\end{matrix}\right.\)
d/ \(-13\left|x\right|=-26\) \(\Rightarrow\left|x\right|=2\) \(\Rightarrow x=\pm2\)
e/ \(x.x-8=-2.\left(-13\right)-\left(-2\right)\)
\(\Rightarrow x^2=36\) \(\Rightarrow\left|x\right|=6\) \(\Rightarrow x=\pm6\)
*) \(-7+2x=-37-\left(-26\right)\)
⇔ \(-7+2x=-11\)
⇔ \(2x=\left(-11\right)-\left(-7\right)\)
⇔ \(2x=-4\)
⇔ \(x=\left(-4\right):2\)
⇔ \(x=-2\)
\(\text{(3x +9).(11-x ) =0}\)
⇔\(\left[{}\begin{matrix}3x+9=0\\11=x=0\end{matrix}\right.\)⇔\(\left[{}\begin{matrix}3x=-9\\x=11\end{matrix}\right.\)⇔\(\left[{}\begin{matrix}x=-3\\x=11\end{matrix}\right.\)
Vậy x= -3 và x= 11
a ) 2 - x = 17 - ( - 5 )
2 - x = 17 + 5
2 - x = 22
x = 2 - 22
x = - 20
Vậy x = - 20
\(-26-\left(x-7\right)=0\\ \Rightarrow x-7=-26\\ \Rightarrow x=-19\)
\(\Rightarrow-26-x+7=0\\ \Rightarrow x+19=0\Rightarrow x=-19\)
-26-(x-7)=0
-26-x+7=0
-19-x=0
x=-19-0
x=-19
-26 - ( x - 7 ) = 0
=> - x + 7 = 26
=> -x = 26 - 7
=> -x = 19
=> x = -19 nha bạn ^^