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= 5(67)-12(16)-18 / 60
= 335-192-18 / 60
= 125/60
= 25/12
= 2 1/12
2) 4/5 x 0,2 x 4 1/3 = 4/5 x 1/5 x 13/3
= 52/75
3)2 2/3 x 4/9 x 15% = 8/3 x 4/9 x 3/20
= 96/540
= 8/45
4) 2/30 : 2,15 : 4 7/10 = 1/15 : 43/20 : 47/10
= 1/15 x 20/43 x 10/47
= 200/30.315
= 40/6.063
5) 35% : 15/25 : 4 7/10 = 7/20 : 3/5 : 47/10
= 7/20 x 5/3 x 10/47
= 350/2820
= 35/282
6) 12/20 x 3 6/10 + (6,5 -12%) = 3/5 x 36/10 + (13/2 - 3/25)
= 108/50 + (25(13)-2(3) / 25)
= 54/25 + (325-6/25)
= 54/25 + 319/25
= 17.226/25
= 689 1/25
7) 25% - 0,24 : 5/15 + 6 9/25 = 1/4 - 6/25 : 1/3 + 159/25
= 1/4 - 6/25 x 3 + 159/25
= 1/4 - 18/25 + 159/25
= 100(1)-4(18)+4(159) / 25
= 100-72+636 / 25
= 664/25
= 26 14/25