ABCD, the absolute value of ABCD is divided by ABCD to get negative 1. Find the absolute value of a in a + B in B + C in C + D in D
It can be seen from the original question that. ABCD is negative
Because when the product of four numbers is negative, one or three of them must be negative
So there must be one or three fractions in the original formula. The numerator and denominator are opposite
When there is a negative value, the sum is - 1 + 3 = 2;
When there are three negative values, the sum is - 3 + 1 = - 2;
So the equation = ± 2
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