Respostas

2013-09-26T15:04:09-03:00
A) 2xy - 6x - x + 6 + 1 - 3xy = 
   - xy - 7x + 7

b) -8a + b + 32a + 4b
   24a + 5b
1 5 1
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2013-09-26T15:07:03-03:00
A) (2xy-6x) + (-x+6) - (-1+3xy)
2xy-6x -x +6+1-3xy
-xy-7x+7

b) -(8a-b)- (-32a-4b)
-8a +b +32a +4b
24a+5b
2 5 2