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U4e0du7b49u5f0f(k 1)x^2+2(k+1)x+2k 1 0
U4e0du7b49u5f0f(k 1)x^2+2(k+1)x+2k 1 0 pictures 5
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U4E0Du7B49u5F0F(k 1)x^2+2(k+1)x+2k 1 0
U4E0Du7B49u5F0F(k 1)x^2+2(k+1)x+2k 1 0
