Calcule o valor das expressões: a (-1+1)²÷(+4)-(-1-1)²×(-2)=
3 9
2 9
b -3-[-6+2÷(-1+1)]=
2 2
c (-3)²-[1-3÷(-1+1)²]=
2 4 2
3 9
2 9
b -3-[-6+2÷(-1+1)]=
2 2
c (-3)²-[1-3÷(-1+1)²]=
2 4 2
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