展开 A(-3,-4)B(2,11)

解答

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A (- 3, - 4) B (2, 11)

- 3 (2 \cdot 11,) A B, - 4 (2 \cdot 11,) A B

求解步骤

A (- 3, - 4) B (2, 11)

= (- 3, - 4) (2 \cdot 11,) A B

使用分配律:

a (b - c) = ab - a c

a = A B (2, 11), b = - 3,, c = 4

= A B (2, 11) (- 3,) - A B (2, 11) \cdot 4

使用加减运算法则

+ (- a) = - a

= - 3 (2 \cdot 11,) A B, - 4 (2 \cdot 11,) A B

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