giải hệ phương trình
1, \(\left\{{}\begin{matrix}2x^2+3y=17\\3x^2-2y=6\end{matrix}\right.\)
2, \(\left\{{}\begin{matrix}\left|x-1\right|+\left|y-1\right|=2\\4\left|x-1\right|+3\left|y-1\right|=7\end{matrix}\right.\)
3, \(\left\{{}\begin{matrix}3\sqrt{x-1}+2\sqrt{y}=2\\2\sqrt{x-1}-\sqrt{y}=4\end{matrix}\right.\)
4 , \(\left\{{}\begin{matrix}x+y=2\\\left|2x-3y\right|=1\end{matrix}\right.\)
5 ,...
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giải hệ phương trình
1, \(\left\{{}\begin{matrix}2x^2+3y=17\\3x^2-2y=6\end{matrix}\right.\)
2, \(\left\{{}\begin{matrix}\left|x-1\right|+\left|y-1\right|=2\\4\left|x-1\right|+3\left|y-1\right|=7\end{matrix}\right.\)
3, \(\left\{{}\begin{matrix}3\sqrt{x-1}+2\sqrt{y}=2\\2\sqrt{x-1}-\sqrt{y}=4\end{matrix}\right.\)
4 , \(\left\{{}\begin{matrix}x+y=2\\\left|2x-3y\right|=1\end{matrix}\right.\)
5 , \(\left\{{}\begin{matrix}2x-y=1\\\left|x-y\right|=\left|2y-1\right|\end{matrix}\right.\)
6,\(\left\{{}\begin{matrix}\left(x-3\right)\left(y+6\right)=xy\\\left(x+2\right)\left(y-2\right)=xy\end{matrix}\right.\)
7 , \(\left\{{}\begin{matrix}\left(x-3\right)\left(2y+5\right)=\left(2x+7\right)\left(y-1\right)\\\left(4x+1\right)\left(3y-6\right)=\left(6x-1\right)\left(2y+3\right)\end{matrix}\right.\)
8 , \(\left\{{}\begin{matrix}4x^2-5\left(y+1\right)=\left(2x-3\right)^2\\3\left(7x+2\right)=5\left(2y-1\right)-3x\end{matrix}\right.\)
Fe2O3+3H2->2Fe+3H2O
Fe+2HCl->FeCl2+H2
FeCl2+2NaOH->Fe(OH)2+2NaCl
Fe(OH)2+MgSO4->FeSO4+Mg(OH)2
2FeCl2+Cl2->2FeCl3
FeCl3+3NaOH->Fe(OH)3+3NaCl
2Fe(OH)3->Fe2O3+H2O
Viết các PTHH theo chuỗi phản ứng.
\(\left(1\right)Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)
\(\left(2\right)Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(\left(3\right)FeCl_2+Ba\left(OH\right)_2\rightarrow Fe\left(OH\right)_2\downarrow+BaCl_2\)
\(\left(4\right)Fe\left(OH\right)_2+H_2SO_4\rightarrow FeSO_4+2H_2O\)
\(\left(5\right)2Fe+3Cl_2\rightarrow2FeCl_3\)
\(\left(6\right)FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3\downarrow+3NaCl\)
\(\left(7\right)2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)