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Sagot :

A=9 /5- 21/5 : 7/15
=9/5-21/5*15/7
=9/5-315/35
=9/5-9
=9/5-45/5
=-36/5
A = 9/5 - 21/5 : 7/15
= 9/5 - 21/5 x 15/7
= 9/5 - 315/35
= 63/35 - 315/35
= -252/35
= -36/5

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