Update ch05-03-callback.md

fortran-fans · Mar 31, 2024 · 8a18f84 · 8a18f84
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diff --git a/src/ch05-03-callback.md b/src/ch05-03-callback.md
@@ -45,3 +45,7 @@ $ fpm run
 
 ## 习题
 - 完成`trapz`数值积分，求解`sin(x)+cos(x)`在`[0,1]`上的积分
+- 完成用于求解微分方程的Runge-Kutta方法`rk4` 计算
+  $$y'=\frac{(e^{-x}-y)}{2},y(0)=0.5$$
+  严格解为
+  $$y=e^{-x}(1.5e^{\frac{x}{2}}-1)$$