解方程组y+x=5 2x+y=k 2x+3y=3k-4
解方程组
y+x=5
2x+y=k
2x+3y=3k-4
人气：290 ℃ 时间：2020-01-30 11:40:55
解答
2x+（5－x）＝k x+5＝k
2x+3（5-x）＝3k-4；化简为15-x＝3k-4所以
15-x＝3（x+5）-4所以x＝1；k＝6；y＝4
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