1、 Write five rational numbers that meet the following conditions Three of them are non positive numbers. 3. Three of them are fractions. 2. It is known that a and B are opposite to each other, C and D are reciprocal to each other, and the distance from X to the origin is 2. Find the value of a + B + CD + X Please give your answer before the evening of September 12, 2011
① Three of them are non negative. 2. Three of them are non positive. 3. Three of them are fractions 0, 7 / 2, 8 / 9, - 5 / 8, - 9. It is known that a and B are opposite to each other, C and D are reciprocal to each other, and the distance from X to the origin is 2