Question

求解高一数学题,过程1.已知f(x)=3|x|,求f(x)的单调区间2.已知已知f(x)=x^3+x,x∈R,判断f(x

Answer 1

(1)f(x)=(x^(1/3)-x^(-1/3))/5

g(x)=(x^(1/3)+x^(-1/3))/5

X属于R

则有:f(-x)=[(-x)^(1/3)-(-x)^(-1/3)]/5

=[x^(-1/3)-x^(1/3)]/5

=-[x^(1/3)-x^(-1/3)]/5

=-f(x...