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Sagot :

Réponse:

Bonjour,

Ex72:

calculer à la main, puis contrôler à la calculatrice?

A=3×4²+5

=3×16+5

=53

B=(3×4)²+5

=9×16+5

=149

C=3×(4²+5)

=3×(16+5)

=63

D=3×(4+5)²

=3×(16+25)

=123

Ex73:

calculer à la main?

A=5+2²

=5+4

=9

B=(5+2)²

=25+4

=29

C=5-2²

=5-4

=1

D=(5-2)²

=25-4

=21

E=5×2²

=5×4

=20

F=(5×2)²

=25×4

=100

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