展开 A(1,3)yB(2,-7)

解答

展开

A (1, 3) y B (2, - 7)

2 (1 \cdot 3,) A y B, - 7 (1 \cdot 3,) A y B

求解步骤

A (1, 3) y B (2, - 7)

= (1 \cdot 3,) (2, - 7) A y B

使用分配律:

a (b - c) = ab - a c

a = A (1, 3) y B, b = 2,, c = 7

= A (1, 3) y B \cdot 2, - A (1, 3) y B \cdot 7

= 2 (1 \cdot 3,) A y B, - 7 (1 \cdot 3,) A y B

\frac{d}{d y} ((x) (x y + 2 y - x - 2))

e x p an d \frac{12}{- 8}

e x p an d - 1 (- 3 x^{2} + 2 x - 5 = 0)

e x p an d (t e^{t y} cos (2 t) - 3) d t

e x p an d (1 - 2 e^{2 x}) (3 x + e^{2 x})