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当y-x=5时,求x^2-y^2+5x+5y+2006的值
人气:132 ℃ 时间:2020-03-23 04:35:43
解答
2006
x^2-y^2+5x+5y+2006
=(x+y)(x-y)+5(x+y)+2006
=(x+y)(x-y+5)+2006
=(x+y)(-5+5)+2006
=2006
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