展开 n(n-3n^2=2)

解答

展开

n (n - 3 n^{2} = 2)

n^{2} - 3 n^{3} = 2

求解步骤

n (n - 3 n^{2} = 2)

= n (n - 3 \cdot 2 = n^{2})

使用分配律:

a (b - c) = ab - a c

a = n, b = n, c = 3 n^{2} = 2

nn - n \cdot 3 n^{2} = 2

nn - 3 n^{2} n = 2

乘开

nn - 3 n^{2} n : n^{2} - 3 n^{3}

n^{2} - 3 n^{3} = 2

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