Respostas

2014-05-23T16:46:33-03:00
A)2x³-3x²+x-1+5x³+6x²-7x+3  = 7x³ + 6x² - 6x + 2


b)8x³-4x²+3x-5-6x³+7x²-5x+9 = 2x³ + 3x² - 2x +4

c)1/2m-1/3mn+2+mn+1-m/2 = 2/3mn + 3

d)2ab²-1/3a²b-3/4ab²+a²b = 8ab² - 3ab² -1a²b +3a²b  =  5ab² + 2a²b
  
  
3 2 3