tolong bantu sy cara mengerjakan soal MTk

7. 8 3/5 + 6 1/2 + 5 2/5
= 43/5 + 13/2 + 27/5
= 86+65+54/10
=205/10
=20 5/10
= 20 1/2
8. 12 3/8 - 4 4/6 - 3 1/2
= 99/8 - 28/6 - 7/2
= 297-112-84/24
= 101/24
= 4 5/24
9. 12 3/7 + 4 5/6 - 10 1/21
= 87/7 + 29/6- 211/21
= 522+203-422/42
=303/42
=7 9/42
= 7 3/14
10. 20 1/8-14 3/6+13 1/4
= 161/8-87/6+53/4
= 483-348+318/24
= 453/24
= 18 21/24
=18 7/8