(_____)*(2a)^2=12a^4-16a^3+4a^2

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(_____)*(2a)^2=12a^4-16a^3+4a^2

(_____)*(2a)^2=12a^4-16a^3+4a^2
(_____)*(2a)^2=12a^4-16a^3+4a^2

(_____)*(2a)^2=12a^4-16a^3+4a^2
(6a^2-8a+2)*(2a)^2=12a^4-16a^3+4a^2

(12a^4-16a^3+4a^2)/(2a)^2
=3a^2-4a+1
所以(_3a^2-4a+1_)*(2a)^2=12a^4-16a^3+4a^2

(6a^2-8a+2)*(2a)^2=12a^4-16a^3+4a^2