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1 - 0,5x + xy : 1, -0,5x, xy
a (do kwadratu) + b - (w ulamku) c/2 : a², b, -c/2
2-7-x-y=-5xy
a(do kwadratu)+b-c/2(w ułamku)=2a+b-c/2(w ułamku)=2a+b-c,2=2-0,2+b-c=1.8+b+c=18bc