Respuesta :

dragon05
One thing for sure it is not b,d,c its a

musiclover10045

1st one -*- =+,+*- = -,-*- = +

2nd one = 0

3rd one-*-=+,+*+=+,+*+=+

4th one +*-=-,-*-=+,+*- = -

 4th one is negative

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