81a²+36ac+4c²=(9а)²+9а•2с•2+(2с)²=(9а+2с)²
81a² + 36ac + 4c² == 9²a² + 2 * 9a * 2c + 2²c² =
= (9a)² + 2 * 9a * 2c + (2c)² =
= (9a + 2c)²
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81a²+36ac+4c²=(9а)²+9а•2с•2+(2с)²=(9а+2с)²
81a² + 36ac + 4c² =
= 9²a² + 2 * 9a * 2c + 2²c² =
= (9a)² + 2 * 9a * 2c + (2c)² =
= (9a + 2c)²