计算;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a285081c514a5fdcbcb24a19a6ed819e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a285081c514a5fdcbcb24a19a6ed819e.png)
2023·陕西咸阳·一模 查看更多[2]
更新时间:2023-03-30 19:07:46
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【推荐1】已知实数a、b满足
,则代数式a2﹣4b2的值为 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7be0f0f15693fca37113942425ed3d9.png)
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【推荐2】下列能用平方差公式计算的是____________ .
①
②
③
④
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e46c37ec2bc64551d9e010ea0339dd19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45b824c187c1c10c847a278dffbaba43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb881e3d02af9f546c80c5c378a2ea1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a426b3f765a83317a9e0ee8f909fa8.png)
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