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6,9 - 2 2/5 = 6,9 - 2,4= 4,5
4,25- 3 1/2= 4,25- 3,5= 0,75
2 1/3 + 3,75= 2 1/3+3 3/4= 2 4/12 +3 9/12=5 13/12= 6 1/12
5,2- 3 1/7= 5 2/10+ 3 1/7= 5 14/ 70+3 10/70= 8 24/70
4,2: 2 1/3= 42/10 * 3/7= 18/70
3 1/2 * 2 1/2 = 7/2 * 5/2= 35/4= 8 3/4
Więcej nie wiem mam nadzieję że pomogłam :)