x,y∈R , m,n∈R, 且m^2n^2x^2m^2 y^2n^2, 则√(m^2 n^2)与x y大小关系？

小编 2025-01-02 23:42:07 游戏 520阅读

m^2n^2x^2m^2 +y^2n^2,显然m^2n^20√(m^2+ n^2)√(m^2+ n^2)√[(y/m)^2+(x/n)^2]≥(|y|+|x|)≥x+y.

题目看不清楚，请说得明白些．