Bonjour,
A= t(7-4) = 3t
C= 3a( 2 +1) = 3a * (3 )
D = a(12-5) = a( 7)
F= xy ( 3 - 4 +2) = xy( 1)
G= a²( 1+1) = a²(2)
H = a²( 1+4-3) = a² ( 2)
