a) ta có: \(-6x=18\)
\(\Rightarrow x=\frac{18}{-6}\)
\(\Rightarrow x=-3\)
b) ta có: \(2x-\left(-3\right)=7\)
\(\Rightarrow2x+3=7\)
\(\Rightarrow2x=7-3\)
\(\Rightarrow2x=4\)
\(\Rightarrow x=2\)
c) ta có: \(\left(x-5\right)\left(x+6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-5=0\\x+6=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-6\end{cases}}}\)
Vậy....
hok tốt!!
\(a,-6x=18\)
<=>\(x=18:\left(-6\right)\)
<=>\(x=-3\)
\(b,2x-\left(-3\right)=7\)
<=>\(2x+3=7\)
<=>\(2x=4\)
<=>\(x=2\)
\(c,\left(x-5\right)\left(x+6\right)=0\)
<=>\(\orbr{\begin{cases}x-5=0\\x+6=0\end{cases}}\)
<=>\(\orbr{\begin{cases}x=5\\x=-6\end{cases}}\)
A) -6x=18
x=18:(-6)
x=-3
Vậy x=-3
B) 2x -(-3)=7
2x+3=7
2x=7-3
2x=4
x=4:2
x=2
vậy x=2
C) (x-5)(x+6)=0
* x-5=0 * x+6=0
x=0+5 x=0-6
x=5 x=-6
Vậy x=5 hoặc x=-6
a) -6x=18
x=18:(-6)
x=-3
b)2x-(-3)=7
2x =7+(-3)
=4
x=4:2=2
c)(x-5)(x+6)=0
x-5=0 x+6=0
x=0+5 x=0-6
x=5 x=-6
+>x bằng 5 hoặc (-6)
#học tốt nhé!~
