78/36 ou 13/6
Explicação:
a²b-ab² =
a²×b-a×b =
(-3/2)²×2/3-(-3/2)×(2/3)² =
(-3/2)²×2/3+3/2×(2/3)² =
9/4×2/3+3/2×4/9 =
18/12+12/18 =
(36÷12×18)+(36÷18×12)/36 =
(3×18)+(2×12)/36 =
54+24/36 =
78/36
78/36 = 78÷2/36÷2 = 39/18 = 39÷3/18÷3 = 13/6
