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= (2 2/3 - 6/10) *0,25 - 1/4=
= (2 20/30 - 18/30) *0,25 - 1/4=
= 2 2/30 *1/4 - 1/4=
= 2 1/15 *1/4 - 1/4=
= 31/15 *1/4 - 1/4=
= 31/60 - 15/60=
= 16/60= 4/15
b) 3 3/5 - 3/5 + 2 1/3=
= 3 + 2 1/3=
= 5 1/3
c) A co do punktu c, to pytanie, czy to chodzi o ułamek 8/5, czy 8 / 5 (8:5)?