Bonsoir,
x = 7² - 4 * 6 * 10
x = 49 - 24 * 10
x = 49 - 240
x = - 191
y = 3/4 * 5/3 - 1/6
y = 15/12 - (1 * 2) / (6 * 2)
y = 15/12 - 2/12
y = 13/12
z = (3/4 - 5/6) : (1 + 7/3)
z = [(3 * 3) / (4 * 3) - (5 * 2) / (6 * 2)] : [(1 * 3) / (1 * 3) + 7/3]
z = (9/12 - 10/12) : (3/3 + 7/3)
z = - 1/12 : 10/3
z = - 1/12 * 3/10
z = - 3/120
z = (3 * - 1) / (3 * 40)
z = - 1/40.
