(a+b)^2怎么求导s/(s+2)^2怎么求导
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(a+b)^2怎么求导s/(s+2)^2怎么求导
(a+b)^2怎么求导
s/(s+2)^2怎么求导
(a+b)^2怎么求导s/(s+2)^2怎么求导
1)假设 a,b 都是变量,则求得是偏导数:
D[(a+b)^2]/Da = 2(a+b),
D[(a+b)^2]/Db = 2(a+b).
2)只有一个变量 s,所以
[s/(s+2)^2]' = 1/(s+2)^2 - 2s/(s+2)^3 = (2-s)/(s+2)^3.