问题标题:
(0.5-x)(600+300*x/0.2)=300
问题描述:

(0.5-x)(600+300*x/0.2)=300

罗道元回答:
  (x-0.5)(1500x+600)=-300   (x-0.5)(5x+2)=-1   5x²-0.5x-1=-1   x(5x-0.5)=0   x=0,x=0.1
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