1/к-1+2к=1+2к×(к-1)/к-1=1+2к^2-2к/к-1=2к^2-2к+1/к-1
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1/к-1+2к=1+2к×(к-1)/к-1=1+2к^2-2к/к-1=2к^2-2к+1/к-1