y=-x^2-2ax(0

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y=-x^2-2ax(0
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y=-x^2-2ax(0
y=-x^2-2ax(0

y=-x^2-2ax(0
y = -x^2-2ax = -(x^2 + 2ax + a^2) + a^2 = a^2 - (x + a)^2 < = a^2,只有当 x = -a 时达到最大值.
由于 0