论文部分内容阅读
1问题的提出从一道高考题谈起:大家可能还记得2004年全国高考新课程卷第(12)题:已知a~2+b~2=1,b~2+c~2 =2,c~2+a~2=2,则ab+bc+ca的最小值为()
1 question put forward from a college entrance examination questions: We may still remember the 2004 National Curriculum Volume (12): Known a ~ 2 + b ~ 2 = 1, b ~ 2 + c ~ 2 = 2, c ~ 2 + a ~ 2 = 2, then the minimum value of ab + bc + ca is ()