tolong bantu saya tentukan nilai a 3×a×(-2)=3×(5×(-2))

3 x a x (-2) = 3 x (5 x (-2))
-6a = 3 x (-10)
-6a = -30
a = (-30) : (-6)
a = 5

Bab Sifat Asosiatif
Matematika SMP Kelas VII

3 x a x (-2) = 3 x (5 x (-2))

   3 x  a x (-2)
   ↓      ↓     ↓
= 3 x (5 x (-2))

maka, a = 5