已知正整数a,b满足4a+b=25,则4/a+1/b最小值为

Question

已知正整数a,b满足4a+b=25,则4/a+1/b最小值为______

Answer 1

4a+b=25>=2倍根号4ab=4倍根号ab 即根号ab=2倍根号ab分之4=4倍根号ab分之1>=25分之16 ...