Equações do 2 grau a) 3x²=75
b) x²=9
    4
c) x²=9
d) x²=36
e) x²=0,36
f)  x²=25
       4
g)x² - 25=0
h) 2x² - 98=0
i) 24=6x²
j) 64x² - 1=0
k) 7x² - 14=0
l) - x² +49 =0 
m) - 25 + 100 x²=0
n) x² - 81 = 0
          4
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