а) \[36a^2 + 12a + 1 = (6a+1)^2\]
б) \[100x^2 - 49y^2 = (10x - 7y)(10x + 7y)\]
в) \[125x^3 - 8y^3 = (5x - 2y)(25x^2 + 10xy + 4y^2)\]
г) \[ y^4 - y^3 + y - 1 = y^3(y - 1) + (y - 1) = (y^3 + 1)(y - 1) = (y - 1)(y + 1)(y^2 - y + 1) \]
Ответ: a) \((6a+1)^2\); б) \((10x - 7y)(10x + 7y)\); в) \((5x - 2y)(25x^2 + 10xy + 4y^2)\); г) \((y - 1)(y + 1)(y^2 - y + 1)\)