Example 1: answer: C.
Example 2: Answer: 90.
Outdoor training
1.C 2。 A 3。 C
4. From PQ//BA, ∠ ABO = ∠ BOP = 45. From PQ//CD, ∠ QOC+∠ OCD = 180.
And ∠ QOC = 88, so ∠ dco = 180-88 = 92.
6. 1 plane rectangular coordinate system
Knowledge carding 1. (a，b) 2。 Positive origin
Interactive new classroom
Example 1. (1) Xiaoming's seat position is 2 rows and 4 columns, and Xiaoli's seat position is 5 rows and 6 columns.
(2) (4,5) indicates the position of row 4 and column 5, Xiao Mingcan's position is (2,4), and Xiao Li Can's position is (5,6).
(3) (3,4) indicates the position of the third row and the fourth column, while (4,3) indicates the position of the fourth row and the third column, so the positions indicated are different.
Example 2. Answer: (3,0) or (-3,0)
Outdoor training
1.(5, 1) 2.(2,2) (6,3) 3.B 4。 D
Grading standard training
/kloc-0 1.b2.d3.c4.b5.36 abscissa and ordinate 3 7. -4
8. (2,6) or (2,6) 9. (3,2)
10. Solution: Ordered number pairs (2,3) and (3.2) are different.
Ordered digit pair (2, 3) represents Room 3 on the second floor, and ordered digit pair (3, 2) represents Room 2 on the third floor.
I hope it will be adopted. Thank you.