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数学
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{x=5y 3x+6y=42
人气:243 ℃ 时间:2019-09-30 20:28:18
解答
x=5y代入 3x+6y=42
得到
15y+6y=42
21y=42
y=2
那么x=5y=10
希望能帮你忙,不懂请追问,懂了请采纳,谢谢
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