tolong bantu pake cara

Ini menurut saya............................

2 1/2 + 1 1/4=
= 3+(1/2+1/4)
= 3 3/4 = 15/4

2 6/12= 2 1/2
2 1/2= 5/2

=5/2 x 4/15
=2/3

9/2-2/3
=18-4/6
= 14/6= 2 2/6= 2 1/3