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1,25·3/4= 1,25 * 0,75 = 0,9375
0,7:7/9= 7/10 * 9/7 = 9/10 = 0,9
(2,125+5/8)·8= (2,125 + 0,625) * 8 = 2,75 * 8 = 22
5 1/4-(0,77+1,33)= 5,25 - 2,1 = 3,15
3,5·1/7+1,8·2/9= 3 1/2 * 1/7 + 18/10 * 2/9 =
= 7/2 * 1/7 + 9/5 * 2/9 = 1/2 + 2/5 = 0,5 + 0,4 = 0,9