zad.2 a) (2/3 * 7 + 2 1/4 - 1 5/6 ) : 3 2/9 = = (14/3 + 9/4 - 11/6) : 3 2/9 = = (56/12 + 27/12 - 22/12) : 3 2/9 = = 61/12 : 29/9 = = 61/12 * 9/29 = = 61/4 * 3/29 = 183/116 = 1 67/116 b) 2 3/8 + 1,75 - (15/25 : 7,5) = = 2,375 + 1,75 - (0,6 : 7,5) = = 4,125 - 0,08 = 4,045 c) (1 2/9 - 2/3) / 1 3/4 : 18 1/3 = =(11/9 - 6/9) / 7/4 : 55/3 = = 5/9 / 7/4 * 3/55 = = 5/9 / 21/220 = 5/9 : 21/220 = 5/9 * 220/21 = 1100/189 = 5 155/189 d) (4,45 - 2 1/2) : 0,6 = (4,45 - 2,5) : 0,6 = 1,95 : 0,6 = 3,23 e) 4,625 + 1 1/8 / 19/40 - 0,4 = = 4,625 + 1,125 / 0,475 - 0,4 = = 5,75 / 0,075 = 76,(6) zad.5 a) 13 % - 2,6 100 % - x 260/13 = 20 b) 26 % - 84,5 100 % - x 8450/26 = 325 c) 111 % - 27 3/4 (27 3/4 =27 75/100 = 27,75) 100 % - x 2775/111 = 25 d) 2 2/3 % - 16 8/3 % - 16 100 % - x 1600 : 8/3 = 1600 * 3/8 = 4800/8 = 600 e) 10,6 % - 5,3 100 % - x 530/10,6 = 50 f) 1 1/5 % - 0,456 1,2 % - 0,456 100 % - x 45,6 / 1,2 = 38
