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Hạ sĩ
Bài 2. cho hệ PT $\left\{ \begin{array}{l} mx+(m+1)y = 1 \\(m+1)x - my =8m+3 \end{array} \right.$ chứng minh hệ luôn có nghiệm duy nhất (x,y) sao cho $(x-1)^2 + (y+2)^2 = 13$
Edited by hoanglong2k, 03-10-2015 - 04:29.
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