√1600 = 40 e - √1600= , Assim , prevalece o sinal antes do radical , Classifique em certo ou errado : a) √25=5 , b) √25= +- 5 ,c) √ 25= -5 , d) -√25 = -5 , e) √36 = 6 , f) √ 36 = +-6
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