\(a,\left(2x+1\right)\left(x^2+2\right)=0\)
\(\left[{}\begin{matrix}2x=-1\\x^2=-2\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=-\frac{1}{2}\\x=\pm\sqrt{2}\end{matrix}\right.\)
\(b,\left(x^2+x+1\right)\left(6-2x\right)=0\)
\(6-2x=0\Leftrightarrow2x=6\Leftrightarrow x=3\)
\(c,\left(x-5\right)\left(3-2x\right)\left(3x+4\right)=0\)
\(\left[{}\begin{matrix}x-5=0\\3-2x=0\\3x+4=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=5\\2x=3\\3x=-4\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=5\\x=\frac{3}{2}\\x=-\frac{4}{3}\end{matrix}\right.\)
\(d,\left(x^2+4\right)\left(7x-3\right)=0\)
\(\left[{}\begin{matrix}x^2+4=0\\7x-3=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x^2=-4\\7x=3\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=\pm2\left(voli\right)\\x=\frac{3}{7}\end{matrix}\right.\)
\(e,\left(8x-4\right)=\left(x^2+x+2\right)\)
\(8x-4=x^2+x+2\)
\(8x-4-x^2-x-2=0\)
\(7x-6-x^2=0\)
\(\left(x-6\right)\left(x-1\right)=0\)
\(\left[{}\begin{matrix}x-6=0\\x-1=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=6\\x=1\end{matrix}\right.\)
\(f,\left(2x-1\right)\left(3x+2\right)\left(5-x\right)\)
đề thiếu hay là rút gọn vậy bn
\(\left(2x-1\right)\left(3x+2\right)\left(5-x\right)=0\)
\(\left[{}\begin{matrix}2x=1\\3x=-2\\x=5\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=\frac{1}{2}\\x=-\frac{2}{3}\\x=5\end{matrix}\right.\)
