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(raiz de 1-0,19+0,3^2-6/25)÷-3
(raiz 0,81+0,09-6/25)÷-3
(0,9+0,09-6/25)÷-3
(9/10+9/100-6/25)÷-3
(90/100+9/100-24/100)÷-3
75/100÷-3
75/100×-1/3
-75/100
-1/4