Respostas

2014-03-27T20:45:29-03:00
A) 2x  x  2x = 4x²+ 2x  x -5=  -10x + 10x - 25 = resposta=  4x² -  25

b) 1 + 4y/2 =0 entao, 4y/2= 1 entao 4y = 2, entao y= 0,5