展开 pi(n-3)^2

解答

展开

π (n - 3)^{2}

π n^{2} - 6 πn + 9 π

求解步骤

π (n - 3)^{2}

(n - 3)^{2} = n^{2} - 6 n + 9

= π (n^{2} - 6 n + 9)

打开括号

= π n^{2} + π (- 6 n) + π 9

使用加减运算法则

+ (- a) = - a

= π n^{2} - 6 πn + 9 π

e x p an d (ln (t - 100) + C) (t - 100)

e x p an d - \frac{x}{2 ( x + 2 )}

e x p an d (- 4, - 3) sin (x)

e x p an d (1, 2, - 1) x (a, b, a + b)

e x p an d (x + y + z + c + d)^{3}