解答

(1 - 6 0) (3 - 2 0)

15

求解步骤

(1 - 6 0) (3 - 2 0)

计算两个向量的标量积:

(x_{1}, \dots, x_{n}) \cdot (y, \dots, y_{n}) = i = 1 \sum n x_{i} y_{i}

= 1 \cdot 3 + (- 6) (- 2) + 0 \cdot 0

化简

1 \cdot 3 + (- 6) (- 2) + 0 \cdot 0 : 15

= 15

流行的例子

e x t re m e \frac{1}{3} x^{3} + 3 x^{2} + 5 x

p er i o d i c i t y f (x) = - 4 cos (2 x)

p er i o d i c i t y f (x) = \frac{1}{5} cos (3 x - π)

d o main f (x) = \frac{9 x - 3}{x - 1}

in t erce pt s f (x) = 2 x^{2} + 3