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3.1. Khi ni?m bi ton d?i ng?u. 3.1.1. Hm Lagrange- Xt BT QHTT d?ng chu?n t?c:f(x)=ctx ? min,Ax = b,(P)x = 0.- Hm L(x,y)=ctx (b-Ax)ty, x?Rn , y?Rm g?i l hm Lagrange c?a BT (P).- i?m (x*,y*)?Rn ? Rm g?i l di?m yn ng?a c?a hm Lagrange L(x,y) n?u:L(x*,y)=L(x*,y*)=L(x,
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