AIDEZ MOI IL Y A DEUX EXERCICE A FAIRE JE N ARRIVE PAS A FAIRE

bonsoir

A = ( 5 x -1) - 2 ( x +3)
A = ( 5 x -1 ) - ( 2x - 6)

b = ( 6 x - 5)²

c = ( x - 6)( x +6)

D = ( x +2)²

E = ( x -4 + 4x -3) ( x - 4 - 4x +3)
E = ( 5 x - 7) ( - 3 x - 1)

f  = ( 3 x - 5)² - ( - 2 x +3)( 3 x -5)
F = ( 3 x -5) ( 3 x - 5 + 2 x - 3)
F = ( 3 x -5) ( 5 x - 8)

A = 3/4 + 5/4 - 5/15 
a =45/60 + 75/60 - 20/60
A = 100/60 = 5/3

B = ( 5/6 - 5/4) : 5/8
B = ( 20/24 - 30/24) : 5/8
B = - 10/24 x 8/5
B = - 80/ 120
B = - 2/3

C = 120 x 10 ⁹ sur 20 x 10 ¹⁰
C = 6 x 10 ⁻¹