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y=ln(x²),求f ‘(1) y=x³+ln(1+x)求dy
人气:129 ℃ 时间:2019-11-15 06:48:36
解答
y=ln(x²)
f'(x)=1/x² *(x²)'=2/x
f'(1)=2/1=2
y=x³+ln(1+x)
dy=[3x²+1/(1+x)]dx写错了是y=ln(X²+x)求f ‘(1)y'=(1/x²+x)*(x²+2x)'=(2x+1)/(x²+x)f'(1)=3/2
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