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1 2/3: (2 2/3 +3/2)=1 2/3: (2 4/6 + 9/6)=1 2/3 : 2 13/6=1 2/3 : 4 1/6= 5/6 : 25/6=
=5/6 . 6/25=skrócić 5 na 1 i 25 na 5 raz 6 na 1 i 6 na 1=1/5
-7 - (-5 2/7)= - 7 + 5 2/7= - 1 5/7
-4,6 + (-1,6)= - 6,2