aidez moi s'il vous plait ex 2,3,4 svp

exo 2 :

AB² = AE²+BE²
       = 6²+8²
AB² = 100
AB = V100 = 10

Aire ABE = (8*6)/2 = 24cm²

3) 8x

4) 8x  24
x = 3

5) 10+5+8+5+6 = 34cm

exo 3 :

x = 4+13
x = 17

7x = 21
x = 3

5x = -3
x =-3/5

3x+1 = 7
3x = -1+6
x = 2

-3x = 11-4
x = -7/3