\item $x^2 + xy + y^2 = 7$, 在 $(2, 1)$ 处. \item $x \cos xy = 0$, 在 $(1, \uppi/2)$ 处. 令 $F(x, y) = x^2 + xy + y^2 - 7$．显然 $F(2, 1) = 4 + 2 + 1 - 7 = 0 ...
Cognitive functioning affects how people think and their ability to remember things. Impairment in this area of brain health may cause a decline in how someone responds to their environment mentally ...
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