e) \(⇔\left[\begin{array}{} x-1=0\\\ 2x+7=0\\ x^2+2=0 \end{array}\right.\)\(⇔\left[\begin{array}{} x=1\\\ x=-\frac{7}{2}\\ x^2=-2(ko.xảy.ra) \end{array}\right.\)\(⇔\left[\begin{array}{} x=1\\ x=-\frac{7}{2} \end{array}\right.\)
\(f) ⇔\left[\begin{array}{} 4x-10=0\\ 24+5x=0 \end{array}\right.\)\(⇔\left[\begin{array}{} x=\frac{10}{4}\\ x=-\frac{24}{5} \end{array}\right.\)
\(g) ⇔\left[\begin{array}{} 3,5-7x=0\\ 0,1x+2,3=0 \end{array}\right.⇔\left[\begin{array}{} x=0,5\\ x=-23 \end{array}\right.\)
\(h) ⇔\left[\begin{array}{} 5x+2=0\\ x-7=0 \end{array}\right.⇔\left[\begin{array}{} x=-\frac{2}{5}\\ x=7 \end{array}\right.\)
