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画线前式为 dy/贺棚耐dx = f'(1+dy/dx) = f' + f'和谨dy/dx,
(1-f')dy/dx = f', dy/禅春dx = f'/(1-f'),
dy/dx = (f'-1+1)/(1-f') = -1 + 1/(1-f').
d^2y/dx^2 = d[-1+1/(1-f')]/dx = {d[-1+1/(1-f')]/df}(df/dx)
= [f''/(1-f')^2]f' = f' · f''/(1-f')^2 (此处书上疑似错误)
(1-f')dy/dx = f', dy/禅春dx = f'/(1-f'),
dy/dx = (f'-1+1)/(1-f') = -1 + 1/(1-f').
d^2y/dx^2 = d[-1+1/(1-f')]/dx = {d[-1+1/(1-f')]/df}(df/dx)
= [f''/(1-f')^2]f' = f' · f''/(1-f')^2 (此处书上疑似错误)
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你好,还有个问题,已经采纳您了
为什么这个题最后求二阶导 还得乘以一个1+y导
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