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Sagot :

Explications étape par étape:

  • a=2 , 2a = 2x2=4 , a²=2²=4, 2a²=2x2²=8, (2a)²=2²x2²=16
  • a=-3 , 2a = 2x(-3)=-6 , a²=(-3)²=9, 2a²=2x(-3)²=2x9=18, (2a)²=2²x(-3)²=36
  • a=1/2x4/3=2/3 , 2a = 4/3 , a²=(2/3)²=4/9, 2a²=2x(2/3)²=8/9, (2a)²=2²x(2/3)²=16/9
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