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确定 k 使得 f(x) = x^2 + kx 在点 x = -3/2 处有水平切线。（答： k = 3 。）
确定 k 使得 f(x) = x^2 + kx 在点 x = -3/2 处有水平切线。（答： k = 3 。）
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