Giải hệ pt: $\left\{\begin{matrix} 9x^{2}+9xy+5x-4y+9\sqrt{y}=7 & \\ \sqrt{x-y+2}+1=9(x-y)^{2}+\sqrt{7x-7y} & \ \end{matrix}\right.$
Giải hệ pt:
Started By luuvanthai, 24-12-2018 - 20:02
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Posted 24-12-2018 - 20:02
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