(2a的平方+3b的三次方)(3b的三次方-2a的平方)

(2a的平方+3b的三次方)(3b的三次方-2a的平方)

(2a的平方+3b的三次方)(3b的三次方-2a的平方)
=(3b的三次方+2a的平方)(3b的三次方-2a的平方)
=9b^6-4a^4