(2 1per8 - 1 3per4) ÷ (3 5per6 - 4 1per4)

=2/8-3/4:15/6-4/4
=2/8-6/8:30/12-12/12
=-4/8:18/12
=-4/8x12/18
=-48/126

(2 1/8 - 1 3/4) : (3 5/6 - 4 1/4)

ubah menjadi pecahan biasa

(17/8 - 7/4) : (23/6 - 17/4)
samakan penyebutnya

( 17/8 - 14/8) : (46/12 - 51/12)
(3/8) : (- 5/12)
3/8 X (-12/5)
-36/40
sederhanakan (:4)
-9/10