展开 α(2,1,-2)

解答

展开

α (2, 1, - 2)

2 α, 1, - 2 α

求解步骤

α (2, 1, - 2)

= (2 \cdot 1,, - 2) α

使用分配律:

a (b - c) = ab - a c

a = α, b = 2, 1,, c = 2

= α \cdot 2, 1, - α \cdot 2

= 2 α, 1, - 2 α

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