对于有理数x,y定义新运算:x*y=ax+by﹣5,其中a,b为常数,已知1*2=﹣9,(﹣3)*3=﹣2,则2a﹣b=_____ .
更新时间:2017-04-18 23:38:33
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【推荐1】在解关于
的方程组
时,可以用①
②
消去未知数x,也可以用
消去未知数
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
______ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
______ .
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510334daa83bed2aa67552d17ca7ac57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b66ed4651bb2821bf417179f28208e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4c4893bf702a5b2cfbe04b48412767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
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