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2. (2 1/3-1,6):(1,25*0,88)=(7/3-8/5):(5/4*22/25) = 11/15*20/22 = 1/3*4/2 = 4/6 = 2/3
3. (3 1/3+1,25):(3 1/3-1,25)= (10/3+5/4):(10/3-5/4) = (40/12+15/12):(40/12-15/12) = 55/12 * 12/25 = 55/25 = 2 5/25 = 2 1/5