分解因式
(1)ax²-16ay²(2)-2a³+12a²-18a(3)a²-2ab+b²-1(4)(m²+n...
(1)ax²-16ay² (2)-2a³+12a²-18a (3)a²-2ab+b²-1(4)(m²+n²)²-4m²n²
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(1)ax²-16ay² = a(x + 4y)(x - 4y)
(2)-2a³+12a²-18a = -2a(a² - 6a + 9) = -a(a - 3)²
(3)a²-2ab+b²-1 = (a - b)² - 1 = (a - b + 1)(a - b - 1)
(4)(m²+n²)²-4m²n² = (m²)² + 2m²n² + (n²)² - 4m²n² = (m²)² - 2m²n² + (n²)² = (m² - n²)²
= (m + n)²(m - n)²
(2)-2a³+12a²-18a = -2a(a² - 6a + 9) = -a(a - 3)²
(3)a²-2ab+b²-1 = (a - b)² - 1 = (a - b + 1)(a - b - 1)
(4)(m²+n²)²-4m²n² = (m²)² + 2m²n² + (n²)² - 4m²n² = (m²)² - 2m²n² + (n²)² = (m² - n²)²
= (m + n)²(m - n)²
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