a的3次方·(负b的3次方)的2次方+(负二分之一ab的2次方)的3次方
=a的3次方· b的6次方-1/8a³的6次方
=7/8a³b的6次方
=7/8x(1/4)³x4的6次方
=7/8x(1/4)³x4³x4³
=7/8x4³
=7/8x64
=56
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