It is known that the absolute values of four rational numbers a, B, C and D are 1.2.3.4 respectively. Can we write a formula so that a + B + C + D = - 2

It is known that the absolute values of four rational numbers a, B, C and D are 1.2.3.4 respectively. Can we write a formula so that a + B + C + D = - 2

-1-2-3+4=-2

The reciprocal of the rational number with the smallest absolute value is ()
A. 1b. - 1C. 0d. Does not exist

∵ the rational number with the minimum absolute value is 0, but 0 has no reciprocal, and the reciprocal of the rational number with the minimum absolute value does not exist

No matter a is any rational number, the reciprocal of the difference between the absolute value of A-1 and the absolute value of 1-A does not exist
Judgment questions
reason

The difference between the absolute value of A-1 and the absolute value of 1-A is 0~