a(x+y)^2+4a-4a(x+y)
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a(x+y)^2+4a-4a(x+y)a(x+y)^2+4a-4a(x+y)a(x+y)^2+4a-4a(x+y)a(x+y)^2+4a-4a(x+y)=a【(x+y)^2-4(x+y)+4】=a(x
a(x+y)^2+4a-4a(x+y)
a(x+y)^2+4a-4a(x+y)
a(x+y)^2+4a-4a(x+y)
a(x+y)^2+4a-4a(x+y)
=a【(x+y)^2-4(x+y)+4】
=a(x+y-2)²
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a(x+y)^2+4a-4a(x+y)
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