December 2018 1 9 Report
Czy to jest poprawne?
(2x-0.5y)²+(3x-0.25y)²=4x²-2xy+0,25y²+9x²-1,5xy+0,0625y²=13x²-3,5xy+0,3125y²

prosze uważnei sprawdzić :)
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