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Sagot :

AYUDA

bjr

2a = 2 x a

si a = 2 => 2 x 2 = 4

a² = a x a

si a = 2 => = 2 x 2 = 4

2a² = 2 x a x a

donc si a = 2 => = 2 x 2 x 2 = 8

et

(2a)² = 2a x 2a = 2 x a x 2 x a

si a = 2 => = 2 x 2 x 2 x 2 = 16

idem avec -3

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