(6 4/5 + 5 3/10) - (1 1/4 + 3 2/5) =

(6 4/5 + 5 3/10) - (1 1/4 + 3 2/5)
= (6 16/20 + 5 6/20) - ( 1 5/20 + 3 8/20)
= 11 22/20 - 4 13/20
= 7 9/20

( 6 4/5 + 5 3/10)
(34/5 + 53/10)
(68 + 53 / 10)
=121 / 10
12 1 /10

(1 1/4 + 3 2/5)
5/4 + 17/5
25 + 68 / 20
=93 / 20
4 13/20


121/10 - 93/20
242 - 93 / 20
149/20
= 7 9/20


Semoga membantu ^^
Maaf kalau salah