若实数a,b满足a﹣2b=4,ab=2,那么a2+4b2=_____ .
18-19七年级·浙江杭州·期中 查看更多[4]
更新时间:2019-05-31 12:32:09
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【推荐1】α,β为关于x的一元二次方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a31b0c61983a035afcfb0ffbe08fa13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
的两个根,则代数式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d2c4a519bd2db2c375643a1fed8c542.png)
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的值为 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a31b0c61983a035afcfb0ffbe08fa13.png)
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【推荐2】已知x2+xy=﹣2,xy+y2=5.则2x2+3xy+y2的值_____ .
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