6 2/3 kurang 5 1/4 bagi 1 1/6 tambah 2 1/2=

6 2/3 - 5 1/4 : 1 1/6 + 2 1/2
= 6 2/3 - (21/4 : 7/6) + 2 1/2
= 6 2/3 - ( 21/4 x 6/7) + 2 1/2
= 6 2/3 - 126/28 + 2 1/2
= 6 2/3 - 4 14/28 + 2 1/2
= 6 2/3 - 4 1/2 + 4 1/2
= (6-4+4) ( 2/3 - 1/2 + 1/2 )
= 6 ( 4/6 - 3/6 + 3/6 )
= 6 4/6
= 6 2/3