如果方程组x-2y=4m+1和2x-y=m-2的解满足3x-y＞0,你能求出m的取值范围吗?
人气：476 ℃ 时间：2020-03-19 05:45:45
解答
x-2y=4m+1.[1]
2x-y=m-2.[2]
[2]*2:
4x-2y=2m-4.[3]
[3]-[1]:
3x=-2m-5
[1]*2-[2]:
-3y=7m+4
y=-(7m+4)/3
3x-y>0
-2m-5+(7m+4)/3>0
-6m-15+7m+4>0
m>11
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