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(6,5+10/3-0,5) :7/3 = (6+10/3)* 3/7=(18/3+10/3) * 3/7=
28/3 * 3/7= 28 : 7=4
c)
7,13 :(2,75-1,6)=7,13 : 1,15= 713 : 115= 31/5= 6,2