Recopie et remplace les pointillés par le signe – ou + de sorte que les égalités soient vraies

a. ..7..3 = - 4

b. ..13..8 = - 21

c. ..3,7..8,4 = 4,7

d. ..45..72 = - 27

e. ..2..7..13 = - 8

Merci
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