7 3/4-3 1/3- 2 1/2= 25/2×30%(jadikan desimal

1.)7 3/4=31/4
3 1/3=10/3
2 1/2=5/2

31/4-10/3-5/2
__________/12
=93--40-30/12
=93-70/12
=23/12
=1 11/12

2.)25/2×30/100
=750/200
=3.750/1.000
=3,75
....

7,75 - 3,33 -2,5 = 12,5 x 0,3 ==> 1,92 = 3,75 ==> 1,92 - 3,75 = -1,83