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b) (1,25 + 0,6) : 0,5 = 1,85 : 0,5= 3,7
c) 1/3 * (5 5/5 - 3/5)= 1/3 * 5 2/3= 1/3 * 17/3= 17/9= 1 8/9
(/ to kreska ułamkowa)
(1 1/4+0,6):0,5=(1,25+0,6):0,5=1,85:0,5=185:5=37
(3 2/3-4)x(6-3/5)=-1/3x5 2/5=-1/3x27/5=27/15=-1 12/15=-1 4/5