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2,6-1/4:[2-(-1,75)]=2 3/5-1/4:[2+1 3/4]=2 3/5-1/4:[3 3/4]=2 3/5 - 1/4:15/4=2 3/5-1/4*4/15=2 3/5-1/15=2 9/15-1/15=2 i 8/15
[-2/3-(-1,8):(-1 1/5)]:(-1/27)=[-2/3-(-1/8):(-6/5)]:(-1/27)=[-2/3-(-1/8)*(-5/6)]*(-27/1)=[-2/3-(5/48)]*(-27/1)=[-32/48-5/48]*(-27/1)=-37/48*(-27/1)=999/48=20 39/48= 20 i 13/16