设f(x,y)=ln(x+y/2x),则f'下标y(1,0)=()A=1B=1/2C=1/4D=1/8

Question

设f(x,y)=ln(x+y/2x),则f'下标y(1,0)=() A =1 B =1/2 C=1/4 D=1/8

Answer 1

选B 求y的偏导 等于(1/2x)X(1/(x+y/2x)) 然后代入x=1 y=0