Why vector Bo vector Ao = vector Ba?

BO-AO=BO+OA=BA
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1. AO*BO=AB?
2. If the vector OA = (3,2) ob = (4,7), then AB =?
3. Known vectors OA = (1,3), OB = (2,5) Given the vector OA = (1,3), OB = (2,5), OC = (m, m), if AB is perpendicular to BC, what is the real number m
4. What does OA vector multiply ob vector = 0 mean
5. Let | vector OA | = | vector ob | = 3, ∠ AOB = 60 °, then | vector OA + vector ob|= By the way!
6. Given vector | OA | = 1, | ob | = √ 3, OA * ob = 0, point C is on line ab Given vector | OA | = 1, vector | ob | = √ 3, vector OA * vector ob = 0, point C is on line AB, and angle AOC = 30 °, find (1) vector OA * vector OC (2) let vector OC = MOA + nob, find the value of real numbers m and n
7. Points a and B (5,0) satisfy the vector OA * vector ob = vector OA * vector Ba, │ vector OA + vector ob = √ 185, and then calculate the a coordinate
8. It is known that I is an imaginary unit. In the complex plane, Z1 = 1 + I, Z2 = 2 + 3I correspond to points a and B, O is the origin, and vectors OP, OA and ob satisfy OP = OA + xob, If point P is in the fourth image term Then the value range of X is?
9. In the geometric sense of vector, it is the distance (i.e. length) from the point of the vector on the coordinate plane to the origin / / must be to the origin (0,0)? Must go to the origin (0,0)? From point (4,5) to point (2,2), no?
10. Given the parallel vector of a plane and two points passing through the plane, how to solve the plane equation
11. If the vector OA (x, y), then is the vector Ao (- x, - y) Why?
12. Is the coordinate of vector Ao the same as that of vector OA?
13. Is negative OA vector equal to Ao vector? Note that OA is negative, not asking if OA is equal to Ao vector!
14. In quadrilateral ABCD, if vector AB = vector DC, it must be () a diamond B parallelogram C rectangle D square
15. In quadrilateral ABCD, AB is parallel to CD, ab = CD, AC bisects ∠ bad, and quadrilateral ABCD is diamond?
16. As shown in the figure, in diamond ABCD, the diagonal lines AC and BD intersect at point O. if OA = 4 and ob = 3, the perimeter of diamond ABCD is () A. 5B. 12C. 16D. 20
17. It is known that the diagonal BD of diamond ABCD is 7cm, ∠ a = 60 ° and the perimeter of diamond is__ cm. Then why can't he have a long diagonal of 7? Stupid
18. In the trapezoidal ABCD, the module of AB = the module of 2dc, AC and BD intersect at O. if the module of AB = a, the module of ad = B, then OC =? The answer is one sixth a + one third B I want to know the process
19. If ab → = a →, ad → = B →, then OC →= Ab →, DC →, a →, B → and so on are vectors
20. E1E2 is the unit vector, E1 = 1, E2 = 1 why