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2 1/2 x 0,4 = 5/2*4/10 = 20/20 = 1
3/5 x 1,1 = (12+22)/20 = 34/20 = 17/10 = 1,7
1 3/5 - 0,6 = 8/5-6/10 = (16-6)/10 = 10/10 = 1
11/20 - 0,45 = (55-45)/100 = 10/100 = 0,1
2/5 : 0,2 = 2/5 *10/2 = 2/1 = 2
1,2 : 3/5 = 12/10*5/3 = 4/2 = 2