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数学
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若2x+5y+4z=6,3x+y-7z=-4,那么x+y-z的值是多少?
人气:420 ℃ 时间:2019-09-11 11:48:34
解答
因为4(2x+5y+4z)+6(3x+y-7z)=4×6+6×(-4)=0,
所以4(2x+5y+4z)+6(3x+y-7z)=26(x+y-z)=0,
所以x+y-z=0.
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