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数学
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已知3x+y+2x=28,5x-3y+z=7,求x+y+z的值
人气：141 ℃ 时间：2020-06-06 12:30:52
解答
x+y+z=4/7(3x+y+2z)-1/7(5x-3y+z)
=15
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