展开 A(1.5)yB(-3,-15)

解答

展开

A (1.5) y B (- 3, - 15)

- 3 (1.5) A B y, - 15 (1.5) A B y

求解步骤

A (1.5) y B (- 3, - 15)

= (1.5) (- 3, - 15) A B y

使用分配律:

a (b - c) = ab - a c

a = A (1.5) y B, b = - 3,, c = 15

= A (1.5) y B (- 3,) - A (1.5) y B \cdot 15

使用加减运算法则

+ (- a) = - a

= - 3 (1.5) A B y, - 15 (1.5) A B y

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