gre数学提问
题目1:Atasale,thecostofeachtiewasreducedby20%andthecostofeachbeltwasreducedby30%
Thepercentreductiononthetotalcostof1tieand2belts和25%比较大小
题目2:Forthelinewithequationy=ax+b,ab不为零thexinterceptistwicetheyintercept
Theslopeoftheline和1/2比较大小
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