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X2 a 1
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X2 a 1
x2-(a-1)x-a u56E0u6570u5206u89E3
x2 2x a 1 a 3
x2 x a 1 a 2
x2 a 1
x2 a 1 x 2 0
x2 a 1 a x 1 0
x2 a 1 a x 1
x2 a 1 x b
