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20 1 1 National Volume of Mathematics and Liberal Arts in College Entrance Examination (Outline Edition) 2 1 There is something wrong with the answer! ! !
x=[-b √(b？ -4ac)]/2

x 1=( -2a-√( (2a)？ -4 * 1 *( 1-2a))/2 =-a-√( a？ +2a- 1)

x2=( -2a+√( (2a)？ -4 * 1 *( 1-2a))/2 =-a+√(a？ +2a- 1)

Where √( (2a)? -4* 1*( 1-2a) ) )=√(4a？ +8a-4) =√4(a？ +2a- 1) =2√(a？ +2a- 1)

Then this 2 is almost the denominator of 2.

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