展开 6(n(n+1)(2n+1))

解答

展开

6 (n (n + 1) (2 n + 1))

12 n^{3} + 18 n^{2} + 6 n

求解步骤

6 (n (n + 1) (2 n + 1))

去除括号:

(a) = a

= 6 n (n + 1) (2 n + 1)

乘开

(n + 1) (2 n + 1) : 2 n^{2} + 3 n + 1

= 6 n (2 n^{2} + 3 n + 1)

乘开

6 n (2 n^{2} + 3 n + 1) : 12 n^{3} + 18 n^{2} + 6 n

= 12 n^{3} + 18 n^{2} + 6 n

e x p an d \frac{( ( x ^{2} + 3 ) ^{5} ( x - 1 ) ^{2} )}{x ^{4} ( x ^{3} + 5 ) ^{3}}

e x p an d \frac{s + 3}{s ( s + 1 ) ( s + 2 )}

e x p an d \frac{x ( x - 11 )}{x - 121}

e x p an d (sin (x))^{\cdot} (1 - cos (x))

e x p an d A (- 3, - 9) B (- 2, - 7)