如题所述
方法如下,请作参考:
①
②
⑤
d^2/dx^2(3 x^2 + x - 1/x) = 6 - 2/x^3
d^2/dx^2((x^2 + 4 x)^3) = 6 x (5 x^3 + 40 x^2 + 96 x + 64)
d^2/dx^2(x log(x)) = 1/x
写的是什么怎么一点都看不懂?