a). 3y^2-6y+3=3*(y^2-2y+1)=3*(y-1)^2
б). 2a^2-a=a*(2a-1)
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a). 3y^2-6y+3=3*(y^2-2y+1)=3*(y-1)^2
б). 2a^2-a=a*(2a-1)