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Giải các hệ phương trình:
a) (I)

$\begin{cases}0,5x+2y=3 \\ 3x+y=4 \end{cases}$ b) (II)

$\begin{cases}\frac{11}{2x-3y}+\frac{18}{3x-2y}=13 \\ \frac{27}{3x-2y}-\frac{2}{2x-3y}=1 \end{cases}$

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