(1)(m-n)平方-3(m-n)+2 (2)a的n+2次方-18a的n方+81a的n-2次方(n大于2)

问题描述:

(1)(m-n)平方-3(m-n)+2 (2)a的n+2次方-18a的n方+81a的n-2次方(n大于2)

(m - n)² - 3(m - n) + 2 = (m - n - 1)(m - n - 2) aⁿ+² - 18aⁿ + 81aⁿ-² = aⁿ-²(a⁴- 18a² + 81) = aⁿ-²(a² - 9)² = aⁿ-²...请详细