Jawabanmu

2014-09-03T06:09:12+07:00
No.7 1 hektar=5/5
        5/5-4/5= 1/5 hektar
no.8 20 3/10 + 31 3/4
        20 12/40 + 31 30/40 =52 2/40 atau 52 1/20