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1,24 - 0,31
= 100/100 + 24/100 - 31/100
=124/100 - 31/100 = 93/100
7,2 - (7,2 + 0,2)
= 7,2 - 7,2 - 0,2
= 0,2
= 2/10 = 1/5
(1,7 - 2/9) - (1/6 + 0,34)
= 100/100 + 70/100 - 2/9 - 1/6 + 34/100
= 204/100 - 4/18 - 3/18
= 51/25 - 7/18 = (51*18 - 7*25)/(25*18)
= 743/450
0,1 - 3,41 + 5,2
= 10/100 - 300/100 - 41/100 + 500/100 + 20/100
= 530/100 - 341/100
= 189/100