三角面积VB基础源代码计算，适合初学者学习 以及开发学习-VB source code base triangle area calculation, suitable for beginners to learn and develop learning

编程序给出热传导方程解析解 条件：-10<x<10,正三角形位于-0.5 <x <0.5 u测试几个数据 -Programmed to give the analytical solution heat conduction equation Conditions:-10 <x <10, equilateral triangle at-0.5 <x <0.5 u test several data