Current location - Training Enrollment Network - Mathematics courses - Math contest ... The minimum positive value of the sum of their paired products A1A2+A1A3+…+A94A95 is _.
Math contest ... The minimum positive value of the sum of their paired products A1A2+A1A3+…+A94A95 is _.
2(a 1 a2+a 1 a3+…+a94a 95)

=(a 1+a2+...+a95)^2-(a 1^2+a2^2+...+a95^2)

=(a 1+a2+...+a95)^2-95

In order to get the smallest positive number, in the above formula, (a 1+A2+...+A95) =11,(10 can't be obtained, because the sum of odd numbers-1,1won't.

So the minimum value is (121-95)/2 =13.

Give me more. Want to ask more questions. I have a difficult question to ask, and I need 200 points.