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
4) 2a - 3b
= 2 x a - 3 x b
= 2 x 5 - 3 x 3
= 10 - 9
= 1
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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