\(\text{(3x+9)*(11-x)=-2}\)
\(\text{(3x+9)*(11-x)=-2}.1=1.-2=-1.2=2.-1\)
TH1, \(\text{(3x+9)*(11-x)=-2}.1\)
\(\Rightarrow\orbr{\begin{cases}3x+9=-2\\11-x=1\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{-11}{3}\\x=10\end{cases}}}\)
Th2, \(\text{(3x+9)*(11-x)=1.-2}\)
\(\orbr{\begin{cases}3x+9=1\\11-x=-2\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{-8}{3}\\x=13\end{cases}}}\)
Th3, \(\text{(3x+9)*(11-x)=-1.2}\)
\(\Rightarrow\orbr{\begin{cases}3x+9=-1\\11-x=2\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{-10}{3}\\x=9\end{cases}}}\)
TH4, \(\text{(3x+9)*(11-x)=2.-1}\)
\(\Rightarrow\orbr{\begin{cases}3x+9=2\\11-x=-1\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{-7}{3}\\x=12\end{cases}}}\)
Vậy x= .. thì y =...
x = .. thì y =...
x=... thì y=...
x=...thi y=...
chúc bạn học tốt
