Sederhanakanlah..... (Mohon Bantu ya....)

a) 6xy x (-2xy) = -12x²y² : 4y² = -3x²
b) 3x³y² x 2xy = 6x⁴y³ : x²y³ = 6x²
c) 15a²b : 5a²b⁴ = 3b-³ x 4ab³ = 12a
d) ⅔a³bc² x ⅜a²b³c² = ¼a^5 b⁴c⁴ : ½ab²c³ = ½a⁴b²c
e) (-½a)³ : (-⅓b)² = -⅛a³ : -1/9b = 9/8a³b x 2b² = 9/4a³b³ = 2¼a³b³