设正数abc满足1/a+ 4/b+ 9/c<=36/a+b+c,则2b+3c/a+b+c= 日期:2021-11-12 07:29:37 人气:1 设正数abc满足1/a+ 4/b+ 9/c<=36/a+b+c,则2b+3c/a+b+c= 权方和不等式,求出b=4a,c=9a,最后等于5/2