zad.20 str.165 a).2x do kwadratu-xy do kwadratu-5x do kwadratu-2xy do kwadratu b).-1/2x3y-2/3xy-1/2x3y-1/3xy
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a . 26 6/9 = 26 2/3
b. = - 3/3 xy - 3/3 * 1/3 *9 = -1 * 1/3 * 9 = - 3