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、 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