作业帮计算题哈,若代数式x^2+y^2-14x+2y+50的值为0.化简求值：[2x^2-(x+y)(x-y)]-[(-x-y)(-x+y)+2y^2]请把每一步写清楚了,
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/04 07:10:25
![计算题哈,若代数式x^2+y^2-14x+2y+50的值为0.化简求值：[2x^2-(x+y)(x-y)]-[(-x-y)(-x+y)+2y^2]请把每一步写清楚了,](/uploads/image/z/131598-54-8.jpg?t=%E8%AE%A1%E7%AE%97%E9%A2%98%E5%93%88%2C%E8%8B%A5%E4%BB%A3%E6%95%B0%E5%BC%8Fx%5E2%2By%5E2-14x%2B2y%2B50%E7%9A%84%E5%80%BC%E4%B8%BA0.%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A%5B2x%5E2-%28x%2By%29%28x-y%29%5D-%5B%28-x-y%29%28-x%2By%29%2B2y%5E2%5D%E8%AF%B7%E6%8A%8A%E6%AF%8F%E4%B8%80%E6%AD%A5%E5%86%99%E6%B8%85%E6%A5%9A%E4%BA%86%2C)
计算题哈,若代数式x^2+y^2-14x+2y+50的值为0.化简求值：[2x^2-(x+y)(x-y)]-[(-x-y)(-x+y)+2y^2]请把每一步写清楚了,
计算题哈,
若代数式x^2+y^2-14x+2y+50的值为0.
化简求值：[2x^2-(x+y)(x-y)]-[(-x-y)(-x+y)+2y^2]
请把每一步写清楚了,
计算题哈,若代数式x^2+y^2-14x+2y+50的值为0.化简求值：[2x^2-(x+y)(x-y)]-[(-x-y)(-x+y)+2y^2]请把每一步写清楚了,
如果使代数式x^2+y^2-14x+2y+50的值为0,则
x^2+y^2-14x+2y+50=0
(x-7)^2+(y+1)^2=0
x=7,y=-1
[2x^2-(x+y)(x-y)]-[(-x-y)(-x+y)+2y^2]
=[2x^2-(x^2-y^2)]-[(x^2-y^2)+2y^2]
=(x^2+y^2)-(x^2+y^2)
=x^2+y^2-x^2-y^2
=0
(好像不应该是这样的呀,原题目中哪儿搞错了?)
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