3) a) Calculons B :
B=1/2 x (2 + 2/2)
B= 1/2 x (2+1)
B=3/2
Calculons C :
C= 1/2 x (3/2+2/(3/2))
C= 1/2 x (3/2 + 2 x 2/3)
C= 1/2 x (3/2 + 4/3)
C=1/2 x (9/6 + 8/6)
C=1/2 x 17/6
C=17/12
Calculons D :
D= 1/2 x (17/12 + 2/(17/12))
D= 1/2 x (17/12 + 2x 12/17)
D= 1/2 x (17/12+ 24/17)
D= 1/2 x (289/204 + 288/204)
D= 1/2 x 577/204
D= 577/408
b) Calculons E :
D'après la calculatrice : E≈1,414 214
Donc, E²≈2,000 001≈2