解方程组3（X+Y）-5（X-Y）16 2（X+Y）-1（X-Y）=15
人气：202 ℃ 时间：2020-02-05 07:28:23
解答
3（X+Y）-5（X-Y）=16
2（X+Y）-1（X-Y）=15
设X+Y=a X-Y=b
则有
3a-5b=16 (1)
2a-b=15 (2)
(1)*2-(2)*3得b=13/7
则a=59/7
则X=36/7 Y=23/7
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