Giải các phương trình và hệ phương trình sau:
\(1)\ 3{{x}^{2}}-2x-4=0\) \(2)\ \ {{\left( 2x-3 \right)}^{4}}-4{{\left( 2x-3 \right)}^{2}}-21=0\) \(3)\ \ \left\{ \begin{align} & x-\frac{2}{y}=1 \\ & 5x+\frac{4}{y}=19 \\ \end{align} \right.\)
A.1) \(S=\left\{ \frac{1+\sqrt{13}}{3};\frac{1-\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{3-\sqrt{7}}{2};\frac{3+\sqrt{7}}{2} \right\}\)
3) \(\left( x;y \right)=\left( 2;1 \right)\)
B.1) \(S=\left\{ \frac{1-\sqrt{13}}{3};\frac{1+\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{3-\sqrt{7}}{3};\frac{3+\sqrt{7}}{3} \right\}\)
3) \(\left( x;y \right)=\left( 3;2 \right)\)
C.1) \(S=\left\{ \frac{1-\sqrt{13}}{3};\frac{1+\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{3-\sqrt{7}}{2};\frac{3+\sqrt{7}}{2} \right\}\)
3) \(\left( x;y \right)=\left( 3;1 \right)\)
D.1) \(S=\left\{ \frac{1-\sqrt{13}}{3};\frac{1+\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{2-\sqrt{7}}{2};\frac{2+\sqrt{7}}{2} \right\}\)
3) \(\left( x;y \right)=\left( -3;1 \right)\)
\(1)\ 3{{x}^{2}}-2x-4=0\) \(2)\ \ {{\left( 2x-3 \right)}^{4}}-4{{\left( 2x-3 \right)}^{2}}-21=0\) \(3)\ \ \left\{ \begin{align} & x-\frac{2}{y}=1 \\ & 5x+\frac{4}{y}=19 \\ \end{align} \right.\)
A.1) \(S=\left\{ \frac{1+\sqrt{13}}{3};\frac{1-\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{3-\sqrt{7}}{2};\frac{3+\sqrt{7}}{2} \right\}\)
3) \(\left( x;y \right)=\left( 2;1 \right)\)
B.1) \(S=\left\{ \frac{1-\sqrt{13}}{3};\frac{1+\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{3-\sqrt{7}}{3};\frac{3+\sqrt{7}}{3} \right\}\)
3) \(\left( x;y \right)=\left( 3;2 \right)\)
C.1) \(S=\left\{ \frac{1-\sqrt{13}}{3};\frac{1+\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{3-\sqrt{7}}{2};\frac{3+\sqrt{7}}{2} \right\}\)
3) \(\left( x;y \right)=\left( 3;1 \right)\)
D.1) \(S=\left\{ \frac{1-\sqrt{13}}{3};\frac{1+\sqrt{13}}{3} \right\}\) 2) \(S=\left\{ \frac{2-\sqrt{7}}{2};\frac{2+\sqrt{7}}{2} \right\}\)
3) \(\left( x;y \right)=\left( -3;1 \right)\)
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Hóa Học lớp 12
