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#2c8bae94-4be2-46aa-b5b1-2e827d9ffafb中等填空题导数与单调性导数

20.(2023春•台州期末)已知实数xxyy满足ex+y+yx=0(e{e}^{x+y}+\frac{y}{x}=0(e为自然对数的底数,e=2.71828e=2.71828\dotsb,则((  ))