[(3x-1/2y^2)^2+(3x+1/2y^2)^2](18x2-1/2y^4)

问题描述:

[(3x-1/2y^2)^2+(3x+1/2y^2)^2](18x2-1/2y^4)

[(3x-1/2y^2)^2+(3x+1/2y^2)^2](18x2-1/2y^4)
=(18x2+1/2y^4) (18x2-1/2y^4)
=324x^4-1/4y^8