Question

alguém me ajuda?? dou 20 pontos ​

Answer 1

Resposta:

Explicação passo a passo:

$d)$

$(a-b)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3}$

$(x-2)^{3}=x^{3}-3.x^{2} .2+3.x.2^{2} -2^{3}=$

$(x-2)^{3}=x^{3}-6x^{2} +12x-8$

$e)$

$(a+b)^{2} =a^{2} +2ab+b^{2}$

$(2b+3c)^{2} =(2b)^{2} +2.(2b).(3c)+(3c)^{2}$

$(2b+3c)^{2} =4b^{2} +12bc+9c^{2}$

$f)$

$(a-b)^{2} =a^{2} -2ab+b^{2}$

$(h-3)^{2} =h^{2} -2.h.3+3^{2}$

$(h-3)^{2} =h^{2} -6h+9$