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数学
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已知方程组{3x+2y=k+1{4x+3y=k-1的解x,y均为负数,就的取值范围
人气:259 ℃ 时间:2020-03-21 08:46:29
解答
3x+2y=k+1 (1)
4x+3y=k-1 (2)
3*(1)-2*(2)
x=k+5
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