the weierstrass theorem （维尔斯特拉斯定理(1) draw diagram of cases in which a feasible set (budget set) is not closed or not bunded,but a solution to the optimization problem exists.(绘制图的情况下,其中一个可行集（预算集）不闭合或不堤壆,但存在的最优化问题的解决方案)(2)show f(x)=1,g(x)=x are continuous functions.显示函数f（x）= 1,G（X）=x是连续函数(3)Does the following function has a maximum on the inverval [-1,1]?If not,explan why.请问以下函数有一个最大的区间[-1,1]?如果没有,请解释原因.f(x)= 1/x,x=/=0； 0,x=0. 英语
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【答案】 问老师吧