111****598
2022-03-23 23:47
解：设每支铅笔x元，每支钢笔y元根据题是得
3x+y=3.1（1）x+3y=6.1（2）将x=6.1-3Y代入（1）得3x6.1-9y+y=3.18y=15.2y=1.9开发者_如何学编程x=6.1-1.9x3x=0.4铅笔每支0.4元钢笔每支1.9元
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
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