Odpowiedź:
=1 3/5×1/4=8/5×1/4=2/5
=(56/72-47/72)×4/5=9/72×4/5=1/10
=6×16/9=32/3=10 2/3
Szczegółowe wyjaśnienie:
(7 - 5 2/5) * 1/4 = 1 3/5 * 1/4 = 8/5 * 1/4 = 2/5
(7/9 - 47/72) : 1 1/4 = (56/72 - 47/72) : 5/4 = 9/72 * 4/5 = 1/8 * 4/5 = 1/10
6 * (1 1/3)² = 6 * (4/3)² = 6 * 16/9 = 2 * 16/3 = 32/3 = 10 2/3
