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b)6/14
c)-5/8
d)11
b)4/7 +(-3/14) + 1/14=8/14 - 3/14 + 1/14=9/14-3/14=6/14=3/7
c)½ + (-¾)+ (-⅝)=4/8- 6/8 - 5/8=4/8 -11/8=- 7/8
d)16⅘ + (-4,8)+3⅕ +(-4⅕)= niestety nie widze ułamków