Ex: résultat sus forme la plus simple possible
A: 3/7x(7/3-5/6)
B:3/7x7/3-5/6
C:12x(1/3-1/6)
D:12x1/3-1/6
ex2:calcul d'une expression
a. B. A+b. A-b. Axb
11/9. 7/9. ..?.. ..?.. ..?..
3/4. 3/16. ..?.. ..?.. ..?..
A: 3/7x(7/3-5/6)
B:3/7x7/3-5/6
C:12x(1/3-1/6)
D:12x1/3-1/6
ex2:calcul d'une expression
a. B. A+b. A-b. Axb
11/9. 7/9. ..?.. ..?.. ..?..
3/4. 3/16. ..?.. ..?.. ..?..
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B 3/7x7/3-5/6=1-5/6=6/6-5/6=1/6
C: 12x(1/3-1/6)=12x(2/6-1/6)=12x(1/6)=12/6=2
D: 12x1/3-1/6=12/3-1/6=24/6-1/6=23/6
exo 2 je suppose que a=A etb=B?
A b A+b A-b Axb
11/9 7/9 11/9+7/9=18/9=2 11/9-7/9=4/9 11x7/9²=77/81
3/4 3/16 3/4+3/16=12/16+3/16 3/4-3/16=12/16-3/16 3x3/4x16=9/64
= 15/16 =9/16
A : 3/7*((14-5)/6) = 3/7*9/6 = 9/14
B : 1-5/6 = 1/6
C : 12*(1/6) = 2
D : 4-1/6 = 23/6
Ex2 :
a. B. A+b. A-b. Axb
11/9. 7/9. 18/9 4/9 77/81
3/4 = 12/16 3/16. 15/16 9/16 36/256