Mathematics
Senior High
数1の因数分解の問題です。1個目の赤線から2個目の赤線になんでなるのか分かりません。教えて頂きたいです。
(2) x³-3xy+y³+1
=x³+y³+1³-3•x.y•l
= (x+y+1)(x² + y² +1²-xy-y∙1−1·x)
(x+y+1)(x²-xy+y²-x-y+1)
=
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