若x﹣y=a,xy=a+3,且x2+y2=5,则a的值为_____ .
更新时间:2020-02-01 11:54:55
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【知识点】 通过对完全平方公式变形求值解读
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【推荐1】若直角三角形斜边长为4,周长为
,则三角形面积等于_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9655b1e705b7a851ea025a5963ef29.png)
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【推荐2】下列四个结论,其中正确的是 ___________ .
①若
,
,则
可表示为
;
②若
的运算结果中不含
项,则
;
③若
,
,则
;
④若
,则x只能是2.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e407d5a901a5ce9f40a02ebc8338f32c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70d2044c4274008c51b7d35cde873624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3c6b5eafb316b170bd35eeac88f091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d5a9b5acbd2b89af2dcac072b197f87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f34b5e49102150ea3570b9f2b983ec4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e8871c9e1f42289021e7b23aa0ae84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ddd4c4f98bcd2c9fc5909851f07a65.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba488fd7746fe9a916f9c9a39c5dd70f.png)
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