[-(m-1)]^2-4m(m-1)≥0
2个回答
[-(m-1)]^2-4m(m-1)≥0
(m-1)²-4m(m-1)≥0
m²-2m+1-4m²+4≥0
-3m²-2m+5≥0
3m²+2m-5≤0
(m-1)(3m+5)≤0
-5/3≤m≤1
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