In the plane rectangular coordinate system, if the distance from point a (3, b) to the origin is 5, then the value of B is______ .
According to Pythagorean theorem: 32 + B 2 = 52, the solution: B = ± 4, so the answer is: ±
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- 1. In the plane rectangular coordinate system, write out the coordinates of the following points: (1) point a is on the negative half axis of the axis, and the distance from the origin is 5 units (2) Point B is on the positive half axis of the axis and is three units away from the origin (3) Point C is in the second quadrant, and its distances to the x-axis and y-axis are 3 units and 4 units respectively
- 2. On the number axis, the number of integer points whose distance from the origin is less than 2 is x, and the number of integer points whose distance from the origin is not more than 2 is y, then the sum of X and y
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