Respostas

2014-04-02T02:22:47-03:00
a)√25x² = 5x
b)√81x (à quarta)= 9x²
c)√(a+b)² = √ a²+ 2.a.b+ b²= a.b√2.a.b
d)√9x²y²= 3.x.y