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用MATLAB最优化工具箱的相关函数编程求解： minf(X)=-4x1—3x2—4x3 s.t. 2x1+2x2+x3—250≤0 x1+4x2+2x3—320≤0 2x1+x2+2x3一260≤0 x1，x2，x3≥0

A.t.

【参考答案】

建立求解程序(ch8-523．m) C=[一4-3一4]； A=[221；142；212]; b=[250320260]......

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