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2) (31/2 - 4,7) * 0,5
1,6-2,35= - 0,75
3) 81/2 - (3/4)2 : 1/2
8 1/2 - 9/16 : 1/2
8 1/2 - 9/8
10/2 - 9/8
80/8 - 9/8 = 71/8= 8 7/8
4) 3,6:0,9 - (1/2)3
3,6:0,9 - 1/8
4 - 1/8 = 3 7/8