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数学
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|2x-y+5|与|3x-2y-2000|互为相反数,则9x-5y=?
RT
人气:132 ℃ 时间:2020-05-11 20:43:38
解答
|2x-y+5|=0
|3x-2y-2000|=0
x=-2010
y=-4015
9x-5y=1985
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