Ответ:
a) y²-6y+9=(y-3)²
b) 144+72y+9y²=(12+3y)²
c) 25x²-40xy+16y²=(5x-4y)²
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Ответ:
a) y²-6y+9=(y-3)²
b) 144+72y+9y²=(12+3y)²
c) 25x²-40xy+16y²=(5x-4y)²