Oblicz.

a)18 +(-21)=………………………………………………………………………………..

b) 2,7 – (- 6,9)= …………………………………………………………………………….

c) - 8 – ( 21/12)= ………………………………………………………………………

d) – 481/7 – ( - 13) =……………………………………………………………………..

e) – 16 + (- 4) + ( -10)=……………………………………………………………………

f)( - 11 ¾) – 4 ½ =……………………………
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