07. Assinale as subtrações que não são possíveis no conjunto N:

a). 1340 + 685=

b). 1500 + 1500 =

c). 2100 + 4000 =

d). 5210 + 8120 =

e). 2901 + 2901 =

f). 1730 + 2000 =​
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