Giải hệ phương trình:
$$2^{\,3\,x+ 1}\,-\,5\cdot 4^{\,x}\,3^{\,y}\,-\,2^{\,x+ 2}\,3^{\,2\,y}\,+\, 3^{\,3\,y+ 1}\,=\, 0\,\,\cdots \boxed{\,\,1\,\,}$$
$$x^{\,2}\,+\,y^{\,2}\,-\,2\,xy\,-\,3\,x\,+\,3\,y\,=\,0\,\,\cdots \boxed{\,\,2\,\,}$$
Giải hệ phương trình:
$$2^{\,3\,x+ 1}\,-\,5\cdot 4^{\,x}\,3^{\,y}\,-\,2^{\,x+ 2}\,3^{\,2\,y}\,+\, 3^{\,3\,y+ 1}\,=\, 0\,\,\cdots \boxed{\,\,1\,\,}$$
$$x^{\,2}\,+\,y^{\,2}\,-\,2\,xy\,-\,3\,x\,+\,3\,y\,=\,0\,\,\cdots \boxed{\,\,2\,\,}$$
$(2) \iff (x-y)^2-3(x-y)=0 \iff (x-y)(x-y-3)=0 ?$
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