f(x)=√x^2 +1*ln(x+√x^2 +1) 则f ' (x)=a.x/√x^2+1 ln(x+√x^2+1)+1b.x/√x^2+1 ln(x+√x^2+1)c.1/√x^2+1 ln(x+√x^2+1)+1d.x/√x^2+1 ln(x+√x^2+1)

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f(x)=√x^2+1*ln(x+√x^2+1)则f''(x)=a.x/√x^2+1ln(x+√x^2+1)+1b.x/√x^2+1ln(x+√x^2+1)c.1/√x^2+1ln(x+√x^2+1)+

f(x)=√x^2 +1*ln(x+√x^2 +1) 则f ' (x)=a.x/√x^2+1 ln(x+√x^2+1)+1b.x/√x^2+1 ln(x+√x^2+1)c.1/√x^2+1 ln(x+√x^2+1)+1d.x/√x^2+1 ln(x+√x^2+1)
f(x)=√x^2 +1*ln(x+√x^2 +1) 则f ' (x)=
a.x/√x^2+1 ln(x+√x^2+1)+1
b.x/√x^2+1 ln(x+√x^2+1)
c.1/√x^2+1 ln(x+√x^2+1)+1
d.x/√x^2+1 ln(x+√x^2+1)

f(x)=√x^2 +1*ln(x+√x^2 +1) 则f ' (x)=a.x/√x^2+1 ln(x+√x^2+1)+1b.x/√x^2+1 ln(x+√x^2+1)c.1/√x^2+1 ln(x+√x^2+1)+1d.x/√x^2+1 ln(x+√x^2+1)
f(x)=√x^2 +1*ln(x+√x^2 +1)
f ' (x)=(√x^2 +1) '*ln(x+√x^2 +1)
+(√x^2 +1)*(ln(x+√x^2 +1))'
= x/√x^2+1 ln(x+√x^2+1)+1 (中间步骤太难输了,略了)
选A
建议看哈求导的法则包括复合函数的