你给的式子不是函数，只是一个方程，谢谢。
没有边界条件，不能化简，谢谢。
by Terrible @ 2024-03-28 19:17:02
@[_8008008](/user/803885)
by czx6666 @ 2024-03-28 19:18:44
$f(a,b) = \frac{1}{4}ab+3f(\frac{a}{2},\frac{b}{2})$
$4f(a,b) = ab+3f(\frac{a}{2},\frac{b}{2})$
$\frac{4}{3}f(a, b) = ab + f(\frac{a}{2},\frac{b}{2})$
$\frac{16}{3}f(a, b) = ab + f(a,b)$
###### ~~xxs的解题过程...~~
by hanshengyuan2024 @ 2024-03-28 19:21:02
@[hanshengyuan2024](/user/1287452) ab也要乘以4/3吧
by _8008008 @ 2024-03-28 19:27:28
@[hanshengyuan2024](/user/1287452) 最后一步怎么推的
by cmaths @ 2024-03-28 21:48:55
@[_8008008](/user/803885) $f(a,b)=3^{\log_4 ab}+ab$ 满足条件
by cmaths @ 2024-03-28 21:50:33