问题标题:
y=-1/2x^2+2x+1配方
问题描述:

y=-1/2x^2+2x+1配方

童明成回答:
  y=-1/2x^2+2x+1   =-1/2(x²-4x)+1   =-1/2(x²-4x+4)+1+2   =-1/2(x-2)²+3
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