Question

efetue as operações entre os monômios:

a) (+3a) + (-7a)
b) (mn) - (-2mn)

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Answer 1

Olá, boa tarde!

Resposta:

a) $\ \Large{\color{blue}{\boxed{\boxed{\boxed{\color{green}{\mathsf{-4a}}}}}}}$

b) $\ \Large{\color{blue}{\boxed{\boxed{\boxed{\color{green}{\mathsf{3mn}}}}}}}$

Explicação passo-a-passo:

a)

$\mathsf{(+3a)+(-7a)}$

$\mathsf{3a-7a}$

$\boxed{\color{green}{\mathsf{-4a}}}$

=======

b)

$\mathsf{(mn)-(-2mn)}$

$\mathsf{mn+2mn}$

$\boxed{\color{green}{\mathsf{3mn}}}$

=======

$\Large{\boxed{\boxed{\Leftarrow \textrm{\color{red}{Att:} \color{purple}{ Deskroot}} \Rightarrow}}}$

Answer 2

Resposta:

Explicação passo-a-passo:

a) (+3a) + (-7a)

= 3a - 7a

= - 4a

Resp.: - 4a

_______________

b) (mn) - (-2mn)

= mn + 2mn

= 3 mn

R.: 3mn