展开 2(n(n+1))

解答

展开

2 (n (n + 1))

2 n^{2} + 2 n

求解步骤

2 (n (n + 1))

去除括号:

(a) = a

= 2 n (n + 1)

使用分配律:

a (b + c) = ab + a c

a = 2 n, b = n, c = 1

= 2 nn + 2 n \cdot 1

= 2 nn + 2 \cdot 1 \cdot n

化简

2 nn + 2 \cdot 1 \cdot n : 2 n^{2} + 2 n

= 2 n^{2} + 2 n

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