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b) 1/3 - ( 1 1/2 - 2,3) = 1/3 - ( 15/10- 23/10 ) = 1/3 - (- 8/10 ) = 1/3 + 4/5 = 5/15 + 12/15 = 17/15 = 1 2/15
c) 1,75 : 2 /3 = 1 3/4 : 2/3 = 7/4 : 2/3 = 7/4 x 3/2 = 21/8 = 2 5/8
mam nadzieję że pomogłam