Question

A)2|x-3|+(-12-6)=0

B)3.(-4)²+(-4).12-34

Answer 1

A)2/x-3/+(-12-6)=0

2/x-3/-18=0

2/x-3/=18

/x-3/=18:2=9

Do đó:x-3=9 hoặc x-3=-9

x=9+3 x=-9+3

x=12 x=-6

Vậy x=12 hoặc x=-6

B)3.(-4)^2+(-4).12-34=3.16+(-48)-34

=48+(-48)-34

=0-34=-34

Answer 2

a,\(2\left|x-3\right|+\left(-12-6\right)=0\)

\(2\left|x-3\right|-18=0\)

\(2\left|x-3\right|=18\)

\(\left|x-3\right|=9\)

\(\Leftrightarrow\left[{}\begin{matrix}x-3=9\\x-3=-9\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-6\end{matrix}\right.\)

Vậy...

Answer 3

b,\(3.\left(-4\right)^2+\left(-4\right).12-34\)

\(=3.16+\left(-4\right).12-34\)

\(=48-48-34\)

\(=-34\)

Answer 4

\(2\left|x-3\right|+\left(-12-6\right)=0\\ \Leftrightarrow2\left|x-3\right|+\left(-18\right)=0\\ \Leftrightarrow2\left|x-3\right|=18\\ \Leftrightarrow\left|x-3\right|=9\\ \Leftrightarrow\left[{}\begin{matrix}x-3=9\\x-3=-9\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=12\\x=-6\end{matrix}\right.\)