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Rozpisałem szczegółowo. Oczywiście skracanie możesz wykonać za jednym razem, a nie stopniowo ;)
b) 2/3 * 18/4 * 1/2 = 1/1 * 6/4 * 1/1 = 6/4 = 3/2 = 1 1/2
c) (3 * 2 * 12 * 4) / (8 * 9 * 6) = (6 * 12 * 4) / (72 * 6) = 288/432 = 18/27 = 2/3
d) 2,4 * 3/8 = 12/5 * 3/8 = 3/5 * 3/2 = 9/10
e) 5/4 * 1,6 = 5/4 * 8/5 = 2/1 = 2
f) 5/3 * 0,9 = 5/3 * 9/10 = 1/1 * 3/2 = 3/2 = 1 1/2