Resposta :
[tex]5x^4\\[/tex]
Divide-se a parte numérica, e quanto à parte algébrica subtrai-se os
expoentes
[tex](15x^6) : (3x^2)\\\\5x^4\\[/tex]
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[tex](15x^6)\div(3x^2)\\\\\dfrac{15x^6}{3x^2}\\\\\dfrac{3(5x^6)}{3x^2}\\\\\dfrac{3(5x^6)}{3(x^2)}\\\\\dfrac{5x^6}{x^2}\\\\\dfrac{x^2(5x^4)}{x^2}\\\\\dfrac{x^2(5x^4)}{x^2.1}\\\\\dfrac{5x^4}{1}\\\\5x^4[/tex]