1)
-2 2 -4
3,9Ă—((10) ) 3,9 (10) -4+5 1 .................. = ........ Ă—. ............ =1,3 Ă— (10 ) =1,3 Ă—10 =13
-5 3 -5
3Ă—(10) (10)
2) 2Ă— (-3+7) + 4Ă· (-2) -5 = 2Ă—4 +(-2) -5 = 8 - 2 - 5 = 6 - 5 =1
3) (2+ 2/3) Ă· (4/5 - 2/3 =(6/3 + 2/3) Ă· (12/15 -10/15) = 8/3 Ă· 2/15
=8/3 Ă—15/2 = 120/6 =20
3 -2 2 -6 2 2
( (2) ) Ă— 4 (2) Ă— ((2) ) -6 4 5 -2 5 3
4) ..................= ..........................= 2 Ă— 2 Ă— 2= 2 Ă— 2 = 2 =8
-5 -5
2 2
2-a) le code de 13 est M
b)le mot formé est : M A T H