3a²y-6ay+3y

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3a²y-6ay+3y
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3a²y-6ay+3y
3a²y-6ay+3y

3a²y-6ay+3y
原式=3y(a²-2a+1)
=3y(a-1)²

3y(a²-2a+1)=3y(a-1)²