Odpowiedzi

2010-02-22T17:32:22+01:00
A)
-½ x³y - ⅔xy +½ x³y - ⅓xy = -xy = -⅓*9 = -9/3 =-3



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2010-02-22T17:32:41+01:00
-2/3xy-1/3xy=(-2/3*1/3*9)-(1/3*1/3*9)=-2-3=-1
1 3 1