a²b-ab²,para a =-3/2e b=2/3
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a²b - ab² a = - 3/2 b = 2/3
(-3/2)² . 2/3 - (-3/2) . (2/3)² ------ (9/4) . 2/3 - (-3/2) . (4/9) --- (18/12) - (- 12/18)
18/12 + 12/18 ------9/6 + 6/9 ----- 3/2 + 2/3 ------ (9 + 4)/6 ------ 13/6
(-3/2)² . 2/3 - (-3/2) . (2/3)² ------ (9/4) . 2/3 - (-3/2) . (4/9) --- (18/12) - (- 12/18)
18/12 + 12/18 ------9/6 + 6/9 ----- 3/2 + 2/3 ------ (9 + 4)/6 ------ 13/6
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