Question

{9x-[4x-(x-y)-5y]+y} Alguem sabe reposta ?

Answer 1

$\{9x-[4x-(x-y)-5y]+y\} = \{9x-[4x-x+y-5y]+y\} =\\ \\ \{9x-[3x - 4y]+y\} = \{9x-3x + 4y+y\} = \{6x + 5y\} \\ \\ \{6x + 5y\}$

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Obrigado pela oportunidade 
Boa sorte, bons estudos!
SSRC - ♑ - 2015 
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