相崎琴音最好看的一部:think about math problem

来源：百度文库 编辑：高考问答 时间：2024/07/08 07:21:18
5x-3y= 3
2x-4y= -10
3x加上y=(?)

7
x=9/7 y=22/7

两个式子相减13

用上面一个式子减去下面一个,即得13

x=79,y=42

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