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Sagot :

LAU09

Réponse:

1) 1/12

2) 5/12

3) 4

Explications étape par étape:

1) A= 1-(2/3+1/4)

A= 1-(2×4/3×4 + 1×3/4×3)

A= 1-(8/12 + 3/12)

A= 1-11/12

A= 1×12/+×12 - 11/12

A= 12/12 -11/12

A= 1/12

B= 3-5/2

1+1/5

B= 3×2/1×2 - 5/2

1×5/1×5 + 1/5

B= 6/2 - 5/2

5/5 + 1/5

B= 1/2

6/5

B= 1/2×5/6

B= 5/12

2) 4/5×35/8=140/40

20×7/20×2=7/2

3) 1/12+5/12+7/2 = 4

Voilà

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