Oblicz pamiętając o kolejności wykonywania działań:
a) 54 : (4 1/2 * 1 1/2 ) - 2 7/8
b) ( 8 - 1 3/7 * 4 23 ) : 1 1/6
matematyka wokół nas klasa 5 str 100 zad 13
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a) 54 : (4 1/2 * 1 1/2 ) - 2 7/8 = 54 : (9/2 * 3/2) - 23/8 = 54 : 27/4 - 23/8 = 54 * 4/27 - 23/8 = 8 - 23/8 = 64/8 - 23/8 = 41/8 = 5 1/8
b) ( 8 - 1 3/7 * 4 2/3 ) : 1 1/6 = (8 - 10/7 * 14/3) : 7/6 = (8 - 20/3) : 7/6 = (24/3 - 20/3) * 6/7 = 4/3 * 6/7 = 8/7 = 1 1/7