2,5-2 1/3=2 1/2-2 1/3=2 3/6-2 2/6=1/6
1/6*(-5 1/7)=1/6*(-36/7)=-6/7
1 1/3:(-5,6)=1 1/3:(-5 3/5)=4/3*(-5/28)=
-5/18
-6/7+(-5/18)=-108/126-35/126=-143/126
=-1 17/126
(2,5 - 2 1/3) * (-5 1/7) + 1 1/3 : (-5,6) = -1 43/84
1) 2 1/2 -2 1/3 = 5/2 -7/3 = 15/6 -14/6 = 1/6
2) 1/6 * (- 5 1/7) = 1/6 * (- 36/7) = -6/7
3) 11/3 : (-5 3/5) = 11/3 : (-28/5) =11/3 * (- 5/28) = - 55/84
4) - 6/7 + (-55/84) = -72/84 - 55/84 = - 127/84 = -1 43/84
