-y - y/1-y +1

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-y - y/1-y +1
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-y - y/1-y +1
-y - y/1-y +1

-y - y/1-y +1
原式=[-y(y-1)-y+(1-y)]/(1-y)
=(-y²+y-y+1-y)/(1-y)
=(-y²-y+1)/(1-y)


-y-y/(1-y)+1
=(y²-y-y+1-y)/(1-y)
=(y²-3y+1)/(1-y)