Question

Marque os pares de monômios que são semelhantes.

5x e -7x

-9abc³ e -9abc

7ab³ e -7ab³

-xyz e 17xyz

-2/3 m²n² e m²n²

Answer 1

$\boxed{\boxed{\boxed{\mathsf{5x~e~-7x}}}}$

$\boxed{\boxed{\boxed{\mathsf{7ab^{3}~e~-7ab^{3}}}}}$

$\boxed{\boxed{\boxed{\mathsf{-xyz~e~17xyz}}}}$

$\boxed{\boxed{\boxed{\mathsf{-\dfrac{2}{3}m^{2}n^{2}~e~m^{2}n^{2}}}}}$