Can multiplication of vector modules be equal to negative values For example: can a module multiply B module equal to minus one? I do a math problem, is two modules multiplied by negative one ~
Can not be negative, vector modules are positive, multiplication can not be negative
RELATED INFORMATIONS
- 1. It is known that, as shown in the figure, the vertices of the equilateral triangle def are on the edges of the equilateral triangle ABC. Proof: ad = be = CF
- 2. The vector a = (COSA, Sina), B = (- 1,2,3,2) proves that the vector a + B is perpendicular to a-b. when 2A + B = a-2b, the angle α is obtained
- 3. It is known that the three sides of a triangle form an arithmetic sequence, the perimeter is 36 cm and the area is 54 cm 2
- 4. Given the function f (x) = ln (1 + x) - X1 + X. (1) find the minimum of F (x); (2) if a, b > 0, prove: LNA LNB ≥ 1-ba
- 5. In RT △ ABC, ∠ C = 90 °, AC = 8, BC = 6, P is the moving point on the inscribed circle m of △ ABC, and the minimum value of the sum of the areas of the three circles with PA, Pb and PC as diameters is obtained
- 6. How to draw the image of y = x / X-1
- 7. |How to draw an image with y | = 1 / x? How to draw this picture? Don't just give the picture some thinking process
- 8. How to draw the image of y = 1 / x ^ 2?
- 9. How to draw the image of y = | x + 1 | + | 2-x | The three intervals of y = | x + 1 | + | 2-x | are 3, 2x-1 and - 2x + 1 respectively. How to draw this kind of image? Another way of saying is that the solution of an interval is - 3, and the absolute value should not be negative, right?
- 10. The graph of absolute value quadratic function
- 11. It is known that ∠ ace = ∠ CDE = 90 °, point B is on CE, CA = CB = CD, through the circle intersection ab of a, C and D to f (as shown in the figure). It is proved that f is the heart of △ CDE
- 12. What is the formula for finding the cosine of the angle between two known vectors?
- 13. As shown in the figure, △ ABC, D and E are the midpoint of BC and AC respectively. BF bisects ∠ ABC and intersects de at point F. if BC = 6, the length of DF is______ .
- 14. It is known that a is the unit vector in the plane. If B is multiplied by (a-b) = 0, then the value range of | B | is I believe you are the best
- 15. A circle is an axisymmetric figure, and each diameter is its axis of symmetry______ .
- 16. Are line segments and angles axisymmetric?
- 17. The application of mathematical equation of one variable and one degree (Grade 6 of middle school) gives high marks During the "June 1" period, when a certain kind of children's clothing is sold in a shopping mall, it can make a profit of 45 yuan per piece. If it is sold at a 15% discount, the profit of each piece is 30 yuan less than that of the original one. How much is the purchase price of this children's clothing? On the application of linear equation of one variable
- 18. In a 1:500 scale plan, the perimeter of a rectangular classroom is 10cm, and the ratio of length to width is 3:2 2. Write the ratio of the area on the graph to the time area, and compare it with the scale. What do you find?
- 19. Why is it that the rounder the moon, the fewer stars there are
- 20. If ABC = 1, then the value of AAB + A + 1 + BBC + B + 1 + CCA + C + 1 is () A. 1B. 0C. -1D. -2