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1) x^{2} – ¼ = 0
x = ± /
2) 1 – 9x^{2} = 0
x = ± /
3) 6x^{2}+9x = 0
x = ,
4) 10x^{2}+19x – 2 = 0
x = , 1/10
5) 4x^{2} = ¼
x = ± /
6) 56x^{2} – 35x = 0
x = 0, /
7) x^{2} – 8x – 65 = 0
x = ,
8) x^{2} – 2x = 0
x = ,
9) 20x^{2} – 7x – 3 = 0
x = / , -1/4
10) 2x^{2} = ^{x}/_{3}
x = , /