(y+1)(y²-y+1)+y(1+y)(1-y)
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(y+1)(y²-y+1)+y(1+y)(1-y)
(y+1)(y²-y+1)+y(1+y)(1-y)
(y+1)(y²-y+1)+y(1+y)(1-y)
=(y+1)(y²-y+1+y-y²)
=y+1
y+1
先提取y+1···
(y+1)(y²-y+1)+y(1+y)(1-y)
(y+1)(y²-y+1)+y(1+y)(1-y)
(y+1)(y²-y+1)+y(1+y)(1-y)
=(y+1)(y²-y+1+y-y²)
=y+1
y+1
先提取y+1···