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数学
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（xy-3/2y-1/2）-（xy-3/2x+1）,其中x=3/10,y=3/8
人气：158 ℃ 时间：2020-03-26 07:48:39
解答
（xy-3/2y-1/2）-（xy-3/2x+1）
=(3/10*3/8-3/2*3/8-1/2)-(3/10*3/8-3/2*3/10+1)
=-129/80
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