1. In the plane rectangular coordinate system, the quadrant of point P (2, - 2) is 2. In the plane rectangular coordinate system, if the point P (a, A-1) is known to be on the X axis, then the coordinate of point P is 3. In the plane rectangular coordinate system, if the known point P (a, b) is on the angular bisector of the first and third quadrants, then the following formula is correct a=b,a+b=0,ab＞0,ab＜0 4. In the plane rectangular coordinate system, if point a is on the positive half axis of Y-axis and 4 unit lengths away from the origin, then the coordinate of point a is 5. In the plane rectangular coordinate system, the distance from point a (3, - 4) to the x-axis is 6. In the plane rectangular coordinate system, if P (a, b) is known to be in the third quadrant, then the following conclusions are correct A a is greater than 0, B is greater than 0, Ba is greater than 0, B is less than 0, CA is less than 0, B is greater than 0, Da is less than 0, B is less than 0 7. In the plane rectangular coordinate system, if the point P (3, n) is in the first quadrant, then the point Q (3, - n) is in the -- quadrant

1. In the plane rectangular coordinate system, the quadrant of point P (2, - 2) is 2. In the plane rectangular coordinate system, if the point P (a, A-1) is known to be on the X axis, then the coordinate of point P is 3. In the plane rectangular coordinate system, if the known point P (a, b) is on the angular bisector of the first and third quadrants, then the following formula is correct a=b,a+b=0,ab＞0,ab＜0 4. In the plane rectangular coordinate system, if point a is on the positive half axis of Y-axis and 4 unit lengths away from the origin, then the coordinate of point a is 5. In the plane rectangular coordinate system, the distance from point a (3, - 4) to the x-axis is 6. In the plane rectangular coordinate system, if P (a, b) is known to be in the third quadrant, then the following conclusions are correct A a is greater than 0, B is greater than 0, Ba is greater than 0, B is less than 0, CA is less than 0, B is greater than 0, Da is less than 0, B is less than 0 7. In the plane rectangular coordinate system, if the point P (3, n) is in the first quadrant, then the point Q (3, - n) is in the -- quadrant

1. Four
2、(1,0),
3、a=b,
4、A(0,4),
5、4,
6、D,
7. Four

In the plane rectangular coordinate system, the quadrant of point P (- 2, xsquare + 1) is the first quadrant of a, the second quadrant of B, the third quadrant of C, and the fourth quadrant of D

Definitely B