(3a²+1/2b)(3a²-1/2b)(9a的4次方-1/4b²)
=(9a的4次方-1/4b²)(9a的4次方-1/4b²)
=(9a的4次方-1/4b²)²
=(9a的4次方)²-2(9a的4次方)(1/4b²)+(1/4b²)²
=81a的8次方-9/2a的4次方b²+1/16b的4次方
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