问题描述:
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,
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,
问题解答:
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