若
,并且
和
互为相反数,计算:2x+y-3z的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90356acb82a0b36b6de131680b74f664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70b4feb90b84eb54fe644c596f5156a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899e6c09e6660f08f6f9e9e64766341f.png)
更新时间:2022-09-04 12:46:52
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【推荐2】若规定两数
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