设幂函数f(x)的图像过p(3,27开4次),g(x)过q(-8,-2),求不等式f(x)小于等于g(x)的解集

f(x)=x^a图像过p(3,27开4次),3^a=27^(1/4)=[(3^3)]^(1/4)=3^(3/4)所以a=3/4〉0g(x)=x^b图像过q(-8,-2),(-8)^b=-2(-2)^3b=(-2)^13b=1b=1/3f(x)