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Sagot :

Ex 25

a)18+(-6.7)

=11.3

b)-51.6+(-19.3)

= -70.9

c)-14.8+7.4

= -7.4

d)36.25+(-48.75)

= -12.5

e) -21+(-78)

= -99

f) -6.75+6.75

=0

Et voilà! ;)

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