Vous pouvez m'aider slvp

A = 3/4 + 2 x 7/3
A = 3/4 + 14/3
A = 9/12 + 56/12
A = 65/12

B = (10⁴ x 6 x 10⁶ x 5) / (2 x (10³)²)
B = (10⁴⁺⁶) / (10⁶) x (6 x 5) / 2
B = 10¹⁰ / 10⁶ x 30 / 2
B = 10¹⁰⁻⁶ x 15
B = 15 x 10⁴
B = 1,5 x 10⁵