Question

Giải hộ mìn hoài này với

|3x-5|= x+2

Answer 1

|3x - 5| = x + 2

\(\Leftrightarrow\left[{}\begin{matrix}3x-5=x+2\\3x-5=-x-2\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}3x-5-x-2=0\\3x-5+x+2=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-7=0\\4x-3=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{7}{2}\\x=\frac{3}{4}\end{matrix}\right.\)

Vậy S = {\(\frac{7}{2}\); \(\frac{3}{4}\)}

Chúc bn học tốt!!

Answer 2

Bài này lớp 7 nhé

\(\Leftrightarrow\left\{{}\begin{matrix}3x-5=x+2\\5-3x=x+2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}3x-5-x-2=0\\5-3x-x-2=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}2x-7=0\\-4x+3=0\end{matrix}\right.\)

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