marieludivine65
Answered

Pouvez vous m'aider pour la 2ème questions svp

on donne: A=2/5 - 1/4 et B=2/3 + 1/6

1) calculer A et B

A= 2×4/5×4 - 1×5/4×5
A= 8/20 - 5/20
A= 3/20

B=2×2/3×2 + 1/6
B= 4/6 + 1/6
B=5/6

2) calculer A+B
A-B
A/B

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Sagot :

maudmarine

Bonjour,

On donne: A=2/5 - 1/4 et B=2/3 + 1/6

1) Calculer A et B

A = 2/5 - 1/4

A = (2 x 4) / (5 x 4) - (1 x 5) / (4 x 5)

A = 8/20 - 5/20

A = 3/20

B = 2/3 + 1/6

B = (2 x 2) / (3 x 2) + 1/6

B = 4/6 + 1/6

B = 5/6

2) Calculer A + B

3/20 + 5/6

= (3 x 3) / (20 x 3) + (5 x 10) / (6 x 10)

= 9/60 + 50/60

= 59/60

A-B

3/20 - 5/6

= 9/60 - 50/60

= - 41/60

A/B

3/20 : 5/6

= 3/20 x 6/5

= 18/100

= (2 x 9) / (2 x 50)

= 9/50.