Mathematics
Senior High
なんで最後(xy+x+1)になるんですか？
どっから1が来たかわかんないです、、
どなたか教えて欲しいです！
(2) xy2-x+y-1=(y²-1)x+y-1
=(y+1)(y−1)x+(y-1)
=(y-1){(y+1)x+1}
=(y-1)xy+x+1)
SI
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