Respostas

2014-02-15T11:58:26-02:00
A)3/4a²b-5/6ab²-1/2
A1)é para trocar o a= -1 e o b= 1/3

3/4a²b-5/6ab²-1/2
(3/4) * (-1)² * (1/3) - (5/6) * (-1) * (1/3)² - 1/2
(3/4) * (1) * (1/3) - (5/6) * (-1) * (1/9) -1/2
3/12 + 5/54 - 1/2
1/3 + 5/54 -1/2 
(18 + 5 - 27) / 54
-4/54
-2/27

B)3/4a²b-5/6ab²-1/2
B1)é para trocar o a= -1/5 e o b=0


3/4a²b-5/6ab²-1/2
(3/4) * (-1/5)² * (0) - (5/6) * (-1/5) * (0)² -1/2
0 - 0 -1/2
-1/2
:)

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