J’ai besoin d’aide pour ces calcul merci

Bonjour

B = (1/4 - 1/5) x (7 + 37/9)

B = [(1 x 5) / (4 x 5) - (1 x 4) / (5 x 4)] x [(7 x 9) / (1 x 9) + 37/9]

B = (5/20 - 4/20) x (63/9 + 37/9)

B = 1/20 x 100/9

B = 100/180

B = (20 x 5) / (20 x 9)

B = 5/9

C = (2/3 + 1/6) : (2 - 1/2)

C = [(2 x 2) / (3 x 2) + 1/6] : [(2 x 2) / (1 x 2) - 1/2]

C = (4/6 + 1/6) : (4/2 - 1/2)

C = 5/6 : 3/2

C = 5/6 x 2/3

C = 10/18

C = (2 x 5) / (2 x 9)

C = 5/9.

Salut !

B= (1/4 - 1/5 ) x (7 + 37/9)

B= ( 1x5/4x5 - 4x1/ 4x5 ) x (7x9/ 1x9 + 37x1/ 9x1 )

B= ( 5/20 - 4/20) x ( 63/9 + 37/ 9)

B= 1/20 x 100/9

B= 1x100/ 20x9

B= 100/ 180

B= 5x20 / 9x20

B= 5/9

C= (2/3 + 1/6 ): (2-1/2)

C= ( 2x6 / 3x6 + 3x1/3x6 ) : ( 2x2/1x2 - 1x1/1x2)

C= ( 12/ 18 + 3/18 ) : ( 4/2 - 1/2 )

C= 15/18 : 3/2

C= 3x5/3x6 : 3/2

C= 5/6 : 3/2

C= 5/6 x 2/3

C= 10/ 18

C= 2x5/ 2x9

C= 5/9