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Sagot :

WXYZ

Bonjour !

1) a - b

= 5 - 3

= 2

2) b - a

= 3 - 5

= -2

3) ab - 17

= a x b - 17

= 5 x 3 - 17

= 15 - 17

= -2

4) 2a - 3b

= 2 x a - 3 x b

= 2 x 5 - 3 x 3

= 10 - 9

= 1

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