问题标题:
2q^2-q-1=0
问题描述:

2q^2-q-1=0

丘杰回答:
  2q^2-q-1=0   q^2-(1/2)q-1/2=0   q^2-(1/2)q+1/16-1/16-1/2=0   (q-1/4)^2=9/16   q-1/4=3/4或q-1/4=-3/4   q=1或q=-1/2
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