【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
选取二次三项式ax2+bx+c(a≠0)中的两项,配成完全平方式的过程叫配方.例如
①选取二次项和一次项配方:x2-4x+2=(x-2)2-2;
②选取二次项和常数项配方:x2-4x+2=(x-2)2+(22-4)x,或x2-4x+2=(x+2)2-(4+22)x
③选取一次项和常数项配方:x2-4x+2=(2x-2)2-x2
根据上述材料,解决下面问题:
(1)写出x2-8x+4的两种不同形式的配方;
(2)已知x2+y2+xy-3y+3=0,求xy的值.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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参考答案:
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参考解析:
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