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x²-2x+1 = (x-1)²
x²-6x+9 = (x-3)²
a²-4ay+4y² = (a-2y)²
y²-10ay+25a² = (y-5a)²
4y²-24xy+36x² = (2y-6x)²
25a²-20ab+4b² = (5a-2b)²
49x²-56xy+16y² = (7x-4y)²
100a²-180ab+81b² = (10a-9b)²