化简求值[(x-y)2+y(4x-y)-4x]/2
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化简求值[(x-y)2+y(4x-y)-4x]/2
其中x=4,y=2013(需要步骤)
其中x=4,y=2013(需要步骤)
![化简求值[(x-y)2+y(4x-y)-4x]/2](/uploads/image/z/16197065-17-5.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%5B%28x-y%292%2By%284x-y%29-4x%5D%2F2)
[(x-y)²+y(4x-y)-4x]/2
=(x²+y²-2xy+4xy-y²-4x)/2
=(x²+2xy-4x)/2
=x(x+2y-4)/2
=4*(4+4026-4)/2
=2*4026
=8052
担心不显示平方符号,图片格式
再问: 不好意思,我在打题目的时候漏了一个x~应该是[(x-y)2+y(4x-y)-4x]/2x,能否在答一遍~用图片格式就行了!麻烦你了谢谢
再答:![](http://img.wesiedu.com/upload/b/76/b7639e7e587f2090b24e832ada21cd2f.jpg)
=(x²+y²-2xy+4xy-y²-4x)/2
=(x²+2xy-4x)/2
=x(x+2y-4)/2
=4*(4+4026-4)/2
=2*4026
=8052
担心不显示平方符号,图片格式
![](http://img.wesiedu.com/upload/e/d6/ed626c5808bce5042412f9d011bd15c6.jpg)
再问: 不好意思,我在打题目的时候漏了一个x~应该是[(x-y)2+y(4x-y)-4x]/2x,能否在答一遍~用图片格式就行了!麻烦你了谢谢
再答:
![](http://img.wesiedu.com/upload/b/76/b7639e7e587f2090b24e832ada21cd2f.jpg)
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