3x+2y=2k,5x+4y=k+3的解之和为x+y=-5秋k的值,并解此方程组
人气：448 ℃ 时间：2019-09-22 09:27:52
解答
3x+2y=2k
5x+4y=k+3
2x+2y=3-k
x+y=(3-k)/2=-5
3-k=-10
k=13
3x+2y=26
2x+2y=-10
x=36
y=-41
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