LA-1 / 2L + LB-1 / 3L + LC-1 / 4L = 0, find the value of a + B + C

Because | A-1 / 2 | > = 0
|b-1/3|>=0
|c-1/4|>=0
To make the sum of the three = 0
All three must be 0
So a = 1 / 2
b=1/3
c=1/4
a+b+c=1/2+1/3+1/4=(6+4+3)/12=13/12

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