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Efectuati:-3/4+5/6=
5/8-2=
-3/10·(15/9)=
28/12-35/15=
2/3:(-12)=
-5/3+1=
5/8-3/4=
2:(1/4)=
-63/40·64/27=
-2/5·3=
-3/6-3/6=
-2/5:1/10=