Escreva cada uma das expressões seguintes, eliminando os parênteses:
a) -(+9)
b) -(-11)
c) +(-13)
d) +(+21)
e) 3-(-2)
f) -(-1+10
g) 7+(6-3)
h) 1-(-1+5)
i) 9+(-4-2)
j) -(1+1-4)
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