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数学
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若2分之x=3分之y=负5分之z求2x分之2x+y+3z的值
人气:114 ℃ 时间:2020-01-26 12:07:37
解答
设2分之x=3分之y=负5分之z=k,所以x=2k,y=3k,z=-5k,带入2x分之2x+y+3z中,为4k分之(4k+3k-15k),等于4k分之-8k,等于-2.
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