展开 A(-5,-4)B(1,1)

解答

展开

A (- 5, - 4) B (1, 1)

- 5 (1 \cdot 1,) A B, - 4 (1 \cdot 1,) A B

求解步骤

A (- 5, - 4) B (1, 1)

= (- 5, - 4) (1 \cdot 1,) A B

使用分配律:

a (b - c) = ab - a c

a = A B (1, 1), b = - 5,, c = 4

= A B (1, 1) (- 5,) - A B (1, 1) \cdot 4

使用加减运算法则

+ (- a) = - a

= - 5 (1 \cdot 1,) A B, - 4 (1 \cdot 1,) A B

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