developer et réduire : 8m+4+(-2m-5) 13k-(2k+4)*10. -5-(4-2x) 10-(x+3)+(-3x+6). (5+2x)-(-7-7x) x-8-(2+4x-9-5x)) Merci

Bonjour,

Développer et réduire :

8m+4+(-2m-5)

= 8m + 4 - 2m - 5

= 8m - 2m + 4 - 5

= 6m - 1

13k-(2k+4)*10

= 13k - (20k + 40)

= 13k - 20k - 40

= - 7k - 40

-5-(4-2x)

= - 5 - 4 + 2x

= 2x - 9

10-(x+3)+(-3x+6)

= 10 - x - 3 - 3x + 6

= - x - 3x + 10 + 6 - 3

= - 4x + 13

(5+2x)-(-7-7x)  

= 5 + 2x + 7 + 7x

= 2x + 7x + 5 + 7

= 9x + 12

x-8-(2+4x-9-5x))

= x - 8 - 2 - 4x + 9 + 5x

= x + 5x - 4x - 8 - 2 + 9

= 2x - 1