請問f''和f'''和f'''' ……怎麼唸呢? (英文)

Question

請問f\'\'和f\'\'\'和f\'\'\'\' ……怎麼唸呢? (英文)
又d/dx df/dx d/dx f(x) 在英文要怎麼唸?

Answer 1

f' = "f prime" or "first derivative of f"
f'' = "f double prime" or "second derivative of f"
f''' = "f triple prime" or "third derivative of f"
f'''' = forth derivative of f
d/dx = 常常是念 "ddx" 可是正式是念 "d over dx" or "take derivative in x"
df/dx = 常常是念 "dfdx" 可是正式是念 "derivative of f in x"
d/dx f(x) = "derivative of function in x" or "take derivative of f(x) in x"

Answer 2

f' : first derivative of ff'' : second derivative of ff''' : third derivative pf f 依此類推d/dx : d over dx df/dx : df over dxd/dx f(x) : d function f over dx