化简 sqrt(n)(8-4sqrt(n))

解答

化简

n (8 - 4 n)

8 n - 4 n

求解步骤

n (8 - 4 n)

使用分配律:

a (b - c) = ab - a c

n (8 - 4 n) = n \cdot 8 - n \cdot 4 n

= n \cdot 8 - n \cdot 4 n

n \cdot 8 = 8 n

- n \cdot 4 n = - 4 n

= 8 n - 4 n

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