3- Simplificando o radical √245, encontraremos:

4- Calcule as adições abaixo:
a) √9+√16
b) 3. √250-4. √90

5- Efetue os produtos notáveis:
a) (5x + 8y)²
b) (3x² + 2y³)²
c) (2a-3b)²
d) (3x*- 3b)³
e) (6x + 1) (6x-1)
f) (3a³b-8x) (3a² + 8x)
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