A= 5 x (3+4)
A = 15 +20
A = 35
B= (7.2 - 6.9) x 2.5
B = 0,3 × 2,5
B = 0,75 ou 3/4
C= 9 x a + 5 x b
C = 9a + 5b
D= 4 x a x b
D = 4ab
E= a + b + a x c
E = 2ac + bc
F= ( a + b ) x (a - b )
F = a² -ab +ab -b²
F = a² -b²
G= a × ( b + c ) × (x + y )
G = (ab + ac) × (x+y)
G = abx + aby + acx + acy
H= 3×5×a×b
H = 15 × a × b
H = 15ab
