若不等式4x2+9y2≥2kxy对一切正数x、y恒成立,则整数k的最大值为________.
3
原不等式可化为≥2k而≥12,∴2k≤12,则整数k的最大值为3
Linda is her mother in many ways. For example, they are both tall and thin.[ ]
A. similar to
B. kind to
C. friendly to
D. different from