两式相加得4x=4m+10 x=m+5/2>0 m>-5/2
两式相减得2y=2m-4 y=m-2
已知关于X,Y的方程｛2x+y=3m+3｛2x-y=m+7的解x＞0,y＜0,求m的取值范围
已知关于X,Y的方程｛2x+y=3m+3｛2x-y=m+7的解x＞0,y＜0,求m的取值范围
数学人气：420 ℃时间：2020-03-27 19:32:35
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