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B) (3 1/2 + 4 3/8) : 19 8/9= (3 4/8+4 3/8) : 19 8/9= 7 7/8 : 19 8/9= 63/8 * 9/179= 567/1432
C) 5/1*7/25 + 1,72= 1 10/25 + 1,72= 1 2/5+1,72= 1,4 + 1,72= 3,12
D) (0,75-0,15) : 4= 0,6 : 4= 0,15
E) (2,4+ 1 5/7) * 4,375 = (24/10+12/7) * 4 3/8 = (2 28/70+1 5/70)*4 3/8= 4 4/35 * 4 3/8= 144/35*35/8=5040/280=18
F) (2/3+1/6) : 2 2/5= (4/6+1/6) : 2 2/5= 5/6 : 2 2/5= 5/6:12/5= 5/6*5/12=25/72