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Sagot :

CHRYSTINE

bonjour

a)-4/45÷16/15

=-4/45x15/16

=-60/720

=-6/72

=-1/12

b)-5/6÷(-15/18)

=-5/6x-18/15

=90/90

=1

c)12÷3/-4

=12x4/-3

=48/-3

=-16

d)1÷(-7/4)

=1x-4/7

=-4/7

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