jednapierwsza - 1 (kreska ułamkowa) jednadruga - (-1)
1/1 -1 0
------------= -------------= 1,5
1/2 -(-1) 0,5 -(-1)
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1/1 -1 0
------------= -------------= 1,5
1/2 -(-1) 0,5 -(-1)