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Sagot :

Bonjour,

a. 1/3 + 2/5

= (1 x 5) / (3 x 5) + (2 x 3) / (5 x 3)

= 5/15 + 6/15

= 11/15

b. 1/3 x 2/5

= 2/15

c. 1/3 - 2/5

= (1 x 5) / (3 x 5) - (2 x 3)  /(5 x 3)

= 5/15 - 6/15

= - 1/15

d. (1/3) / (2/5)

= 1/3 x 5/2

= 5/6.

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