(k+3)x²-kx+1=0

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(k+3)x²-kx+1=0(k+3)x²-kx+1=0(k+3)x²-kx+1=0K+3≠0K2-4(K+3)≥0分别解,得K≠-3K≥6或K≤-2合:K的取值范围K≥

(k+3)x²-kx+1=0
(k+3)x²-kx+1=0

(k+3)x²-kx+1=0
K+3≠0
K2-4(K+3)≥0
分别解,得
K≠-3
K≥6或K≤-2
合:
K的取值范围K≥6或K≤-2且K≠-3