求下列函数的导函数
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2. (1) f(x) = 2x^2 + 3xf'(3),则 f(0) = 0, f'(x) = 4x+3f'(3),
f'(3) = 12 + 3f'(3), 得 f'(3) = -6, 得 f(x) = 2x^2-18x.
(2) f(x) = 2x^2-18x , f'(x) = 4x-18, f'(4) = -2, 即 x = 4 处切线斜率
直线 ax+by-2 = 0 的斜率 k = -a/b, 则上述切线斜率是 b/a , 则 b/a = -2
f'(3) = 12 + 3f'(3), 得 f'(3) = -6, 得 f(x) = 2x^2-18x.
(2) f(x) = 2x^2-18x , f'(x) = 4x-18, f'(4) = -2, 即 x = 4 处切线斜率
直线 ax+by-2 = 0 的斜率 k = -a/b, 则上述切线斜率是 b/a , 则 b/a = -2
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