(xy的3n次方)的2次方+(xy的6次方)的n次方

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(xy的3n次方)的2次方+(xy的6次方)的n次方

(xy的3n次方)的2次方+(xy的6次方)的n次方
(xy的3n次方)的2次方+(xy的6次方)的n次方

(xy的3n次方)的2次方+(xy的6次方)的n次方
=xy的6n次方+xy的6n次方
=2xy的6n次方