Respostas

2013-12-15T16:22:59-02:00
-3*x² = 81
x² = 81/3
x² = 27
x = √27
2 5 2
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2013-12-15T16:24:06-02:00
-3.x²=81
-3x²=81
-3x²-81=0

-3x²=81        
-x²=81/3
-x²=27
x= +-√27
2 5 2