Ответ:
2) 4c^2 + 12c + 9 = (2c + 3)^2
4) 81x^2 - 18xy + y^2 = (9x - y)^2
6) 100a^2 + b^2 + 20ab = (10a + b)^2
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Ответ:
2) 4c^2 + 12c + 9 = (2c + 3)^2
4) 81x^2 - 18xy + y^2 = (9x - y)^2
6) 100a^2 + b^2 + 20ab = (10a + b)^2