C= 1/9-(5/3)²* 1/30 = sous forme de fraction irreductible D = (-3/4+1/2)²/ 3-1/2 =sous forme de fraction irreductible

C =  1/9 - (5/3)² * 1/30 

C = 1/9 - (5²/3²) x 1/30
C = 1/9 - (25/9) x 1/30
C = 1/9 - 25/270
C = 1 x 30 / 9 x 30 - 25/170
C = 30/170 - 25/170
C = 5/170
C = 5 x 1 / 5 x 34
C = 1/34

D = (-3/4 + 1/2)² / 3 - 1/2
D = (- 3²/4² + 1²/2²) / 3 - 1/2
D = (9/16 + 1/4) / 3 - 1/2
D = (9/16 + 1 x 4 / 4 x 4) / 3 - 1/2
D = (9/16 + 4/16) / 3 - 1/2
D = 13/16 / 3 - 1/2
D = 13/16 x 1/3 - 1/2
D = 13/48 - 1/2
D = 13/48 - 1 x 24 / 2 x 24
D = 13/48 - 24/48
D = - 11/48