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5 1/4 - ( 0,78 + 1,33) = 21/4 - (78/100 + 133/100) = 21/4 - 211/100 = 525/100 - 211/100 = 314/100 = 3,14
3,5 x 1/7 + 1,8 x 2/9 =35/10 * 1/7 + 18/10 * 2/9 = 5/10 + 2/5 = 5/10+4/10 = 9/10 = 0,9
10,6 : ( 2 1/4 + 2,75) = 10,6 : (2,25 + 2,75) = 10,6 : 5 = 2,12