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若xy互为相反数,求x+2x+3x+...+100x+100y+99y+98y+,+2y+y的值
人气:134 ℃ 时间:2020-06-13 09:52:07
解答
因为x,y互为相反数x+y=0
x+2x+3x+...+100x+100y+99y+98y+,+2y+y
=(x+y)+2(x+y)+3(x+y)+...+100(x+y)
=0
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