均值不等式求最值的若干变形技巧１６３３１１黑龙江大庆实验中学毕明黎高级中学课本《代数》下册（必修）第９页给出如下命题：巳知ｘ、ｙ∈Ｒ＋，ｘ＋ｙ＝ｓ，ｘｙ＝ｐ．求证．（１）如果ｐ是定值，那么当且仅当ｘ＝ｙ时ｘ的值最小，（２）如果ｓ是定值，那么当且仅当ｘ... Deformation techniques for finding the best value of the mean inequality 163311 Heilongjiang Daqing Experimental Middle School Bi Mingli Senior Middle School textbook “Algebra” The next volume (required) Page 9 gives the following propositions: 巳 know x, y ∈ R +, x + y = s, xy = p. Proof. (1) If p is a fixed value, the value of x is smallest if and only if x=y, (2) if s is a fixed value, then if and only if x...