解方程组｛5X+3Y=6 ｛3X-2Y=15
人气：150 ℃ 时间：2020-01-29 06:47:11
解答
5X+3Y=6 ----------------1
3X-2Y=15 ----------------2
1式乘以3 变为 15X+9Y=18 -------------4
2式乘以5变为 15X-10Y=75 --------------5
4式减去5式等于 19Y=-57 解得Y=-3
把Y=-3代入1式中,解得X=3
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