(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/4b^2)

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(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/4b^2)(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/4b^2)(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/

(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/4b^2)
(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/4b^2)

(3a^2+1/2b)(3a^2-1/2b)(9a^4-1/4b^2)
=(9a^4-1/4b^2)^2=81a^8-(9/2)a^4*b^2+(1/16）b^4