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= 7 2/3 - 20/3 * 9/100 = 7 2/3 - 9/15 = 7 10/15 - 9/15 = 7 1/15
3,5 * 2/5 + 7/25 : 0,7 =35/10 * 2/5 + 7/25 :7/10 =
= 7/5 + 7/25 * 10/7 = 7/5 +2/5 = 9/5 = 1 4/5 = 1,8