Mathematics
Senior High
1行目の式から2行目の式になる理由がわかりません
誰かお願いしますm(_ _)m
(3) (与式)ニ(<の*(xう*ー2(の2十の)xPyf上(gーの*(92
=ニ(ーッ) ((Z寺のーー(g一の9
=(ァ+y) (メー?》)((<十のァ十(一 のy]} (e+のァ-(@ニ
=(ァオッ) (z= ーツ(qx+ 6r+gyー09)(ge+
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