5m Zen
K 1 x 2 2k 1 x 1
K 1 x 2 2k 1 x 1 pictures 5
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K 1 x
K 1 x 2 2k 1 x 1
u4E0Du7B49u5F0F(k-1)x^2+2(k+1)x+2k-1 0
k 1 x 2 2k 1 x 1 0
