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b)-12
c)-15
d)-4
e)-60
f)6+(-5)=1
g)23+(-59)=-36
4*3,70+3=21,70
14,80+3=21,70
21,70-14,80=cena 3 ołówków
6,9=cena 3 ołówków/:3
1 ołówek=2,30