Jawabanmu

2014-09-08T20:12:29+07:00
81 : a x -3 = -3
81 : -3a = -3
Itukan brti
81/-3a = -3
Trus pindah ruas jadi
-3a x -3 = 81
9a = 81
A = 81/9
A = 9
salah tuuh jawabannya seharusnya 81 coba dihitung dulu
2014-09-08T20:16:50+07:00
81 : a x (-3) = (-3)
81 x 1/a x (-3) = (-3)
81 x 1/a x (-3) : 81 : (-3) = (-3) : 81 : (-3)
81 x 1/a x (-3) x 1/81 x 1/(-3) = (-3) x 1/81 x 1/(-3)
1/a = 1/81
a = 81

ka caranya gak ngerti, tolong jelasin lgi ka plis