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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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