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b)136-42+38-18=114
C) 154-79-54=21
D) 84-(240-165)=84-75=9
e) 340+89-19+21=429-19+21=431
f) 520 - [127-(42-15)+200]=520-[327-27]=520-300=220
Pozdrawiam :)
b) 136-42+38-18=94+38-18=114
c) 154-79-54=100-79=21