Bonjour

Calculez A = - 1 + x - y pour :

a. x = 2/3 et y = -2/4

A = -1 + 2/3 - (-2/4)

A = -1 + (2*2)/(3*2) + 1/2

A = -1 + 4/6 + (1*3)/(3*2)

A = -6/6 + 4/6 + 3/6

A = -6/6 + 7/6

A = 1/6

b. x = -1/4 et y = 5/6

A = -1 - 1/4 - 5/6

A = -1 - (1*3)/(4*3) - (5*2)/(6*2)

A = -1 - 3/12 - 10/12

A = -12/12 - 13/12

A = -25/12