August 2018 1 6 Report
Zapisz dane wyrażenia, nie używając nawiasów .;]

a) -(-a)+(-b) =.....
b) -(-a)-(-b)=..
c) a+(-(-b))=..
d) a-(-(-b))+..
e)-(-(a-b))=..
f)a-(b-a)=...

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