Respostas

  • Usuário do Brainly
2014-08-15T19:00:16-03:00
Temos que, (a+b)^3=a^3+3a^2b+3ab^2+b^3.

Assim,

(x+\frac{3}{7})^3=x^3+3\cdot x^2\left(\frac{3}{7}\right)+3\cdot x\cdot\left(\frac{3}{7}\right)^2+\left(\frac{3}{7}\right)^3

(x+\frac{3}{7})^3=x^3+\frac{9x^2}{7}+\frac{27x}{49}+\frac{27}{343}
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