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Sagot :

7,8+6+ 2 = 7,8+6= 13,8+2= 15,8

6x5= 6+6+6+6+6 = 30
1
442
442
442
——
1 326

15-(17-(30-2x10))
= 15- (17-(30-20))
= 15-(17-10)
=15-7
=8

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