23.(1) (2x^3n)^2-(3x^n)^2
化简:4x^6n-9x^2n
=4(x^2n)^3 -9(x^2n)
=4* 2^3-9*2
=4*8-18
=32-18
=14
(2) 原式=a^m÷a^2k*a^3n
=9÷4^2×8^3
=9/16*8*8*8=288
23.(1) (2x^3n)^2-(3x^n)^2
化简:4x^6n-9x^2n
=4(x^2n)^3 -9(x^2n)
=4* 2^3-9*2
=4*8-18
=32-18
=14
(2) 原式=a^m÷a^2k*a^3n
=9÷4^2×8^3
=9/16*8*8*8=288