(a – b)² – c², quando a = 2/3, b = 1 e c = -1​

Respostas

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Explicação passo-a-passo:

( a – b) . (a – b) – c²

a² -ab – ab + b² – c²

a² – 2ab – c²

(2/3)² – 2 . 2/3 . 1 – ( -1)²=

4/9 – 4/3 – (+1)=

4/9 – 4/3 – 1=

4 – 12 – 9

_________=

9

4 – 21

______=

9

– 17/9