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4X+K=7(1) 3X-5Y=16(2) X=Y(3) 把(3)式代入(2)得: 3X-5X=16 -2X=16 X=-8; Y=-8; 代入(1)得: -32+K=7 K=39 所以方程組的 X=8; Y=8; K=39.
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