Mathematics
Senior High

3行目から4行目の計算の仕方を教えてください。
お願いします!

(2) x+3xy+y°-1 夏 毛( 燥因] 8.4)ろ =(x°+y°-1)+3xy =x'+y°+(-1)-3x*y.(-1) ま番 =(x+y+(-1)}{x°+y°+(-1)°-x*y-y·(-1)-(1).x} =(x+y-1)(x°-xy+y°+x+y+1)

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