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Sagot :

Bonjour,

2)

Distributivité:

5*2a = 10a

5* +6b = +30b

= 10a + 30b

3a * b = 3ab

3 * +7a = +21a

=> 3ab + 21a

8c * 8a = 64ac

-2a * 8a =  - 16a²

=> 64ac - 16a²

2)

7 * 5a  + 7 * b

a *a + a * b

4 * 4x + 4 * 3y

4a * 3b  + 4a * 4c

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