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Bonsoir

A = 5/8 + 5/2 * 1/2

= 5/8 + 5/4

= 5/8 + 10/8

= 15/8

D = 1/24 - ( 12/30 + 4/6)

= 1/24 - ( 12/30 + 20/30)

= 1/24 - ( 32/30)

= 1/24 - ( 16/15 )

= 1/24 - 16/15

= 5/120 - 128/120

= -123/120

= -41/40

Réponse :

Explications étape par étape

Bonsoir

A = 5/8 + 5/2 x 1/2

A = 5/8 + (5 x 1)/(2 x 2)

A = 5/8 + 5/4

A = 5/8 + (5 x 2)/(4 x 2)

A = 5/8 + 10/8

A = (5 + 10)/8

A = 15/8

D = 1/24 - (12/30 + 4/6)

D = 1/24 - [12/30 + (4 x 5)/(6 x 5)]

D = 1/24 - (12/30 + 20/30)

D = 1/24 - 32/30

D = (1 x 5)/(24 x 5) - (32 x 4)/(30 x 4)

D = 5/120 - 128/120

D = (-123/120)

D = (-3 x 41)/(3 x 40)

D = (-41/40)