展开 A(5,-3)B(5,3)

解答

展开

A (5, - 3) B (5, 3)

5 (5 \cdot 3,) A B, - 3 (5 \cdot 3,) A B

求解步骤

A (5, - 3) B (5, 3)

= (5, - 3) (5 \cdot 3,) A B

使用分配律:

a (b - c) = ab - a c

a = A B (5, 3), b = 5,, c = 3

= A B (5, 3) \cdot 5, - A B (5, 3) \cdot 3

= 5 (5 \cdot 3,) A B, - 3 (5 \cdot 3,) A B

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