2k-1²-(4×k²×1)≥0化简
问题描述:
2k-1²-(4×k²×1)≥0化简
答
(2k-1)²-(4×k²×1)≥0
4k²-4k+1-4k²≥0
-4k+1≥0
-4k≥-1
k≤0.25