(- 2000 5 / 6) + (- 1999 2 / 3) + 4000 3 / 4 + (1 1 / 2) have process

(- 2000 5 / 6) + (- 1999 2 / 3) + 4000 3 / 4 + (1 1 / 2) have process

(- 2000 5 / 6) + (- 1999 2 / 3) + 4000 3 / 4 + (1 1 / 2)
=-2000-1999+1+4000+1/2+3/4-2/3-5/6
=-4000+4000+2/4+3/4-4/6-5/6
=7/4-9/6
=7/4-6/4
=1/4