bonsoir
A=3 π +2 = 3 * π + 2
B=ab-4 = a * b - 4
C=5(2 π - 7) = 5 * ( 2 * π - 7 )
D= 2a(2+8) = 2 *a * ( 2 + 8)
E=3a-5b = 3 * a - 5 * b
F=ab + 3 X (3x+7) = a * b + 3 * ( 3 * x + 7)
G=b-a+ 7(3x+7) = b - a * ( 3 * x + 7 )
H= a + a - 7b +1 = a + a - 7 * b + 1