Question

设x^2n=3,求(1/3x^3n)·[4(x^5)^n]

Answer 1

(1/3x^3n)·[4(x^5)^n]

=1/27*x^3n*4*x^5n

=(4/27)*x^8n

=(4/27)*(x^2n)^4

=(4/27)*3^4

=(4/27)*81

=4*3

=12