Question

Determine o valor numérico de cada expressão algébrica.​

Answer 1

$Respostas~~a)+15;~~~b)+16;~~~c=0;~~~d)+\dfrac{13}{16} ;~~ e)+25$

Expressões algébricas

Vamos efetuar os cálculos das expressões

Para tal vamos substituir os valores atribuídos as incógnitas e efetuar os cálculos.

$a)2a-5b=\\\\\\para~~a=0, e~~b=-3\\\\\\Substituindo,~~temos:\\\\\\2.0-5.(-3)=\\\\\\Resposta=+15\\\\\\\\\\b)(2m+n)^2=\\\\\\para~~~m=-\dfrac{1}{2} ~~e~~n=-3\\\\\\Substituindo,~~temos:\\\\\\(2.(-\dfrac{1}{2} -3)^2\\\\\\(-1-3)^2\\\\\\\\(-4)^2\\\\\\Resposta=+16$

$c)\dfrac{a+b}{a-b} =\\\\para~a=1, ~~~e~~~b=-1\\\\\\substituindo,~ temos:\\\\\\\dfrac{1-1}{1-(-1)} =\\\\\\Resposta~=~0\\\\\\d)~~p^2+q^2\\\\\\para~~p=\dfrac{3}{4} ~~~e~~q~=\dfrac{1}{2} \\\\\\(\dfrac{3}{4})^2+(\dfrac{1}{2} )^2=\\\\\\\\(\frac{9}{16} )+(\dfrac{1}{4})=\\\\\\mmc=16\\\\\\=\dfrac{9+4}{16} \\ \\\\Resposta=+\dfrac{13}{16} \\\\\\e)3m+4n=\\\\\\para~~m=3,~~e~~n=4$

$=3.(3)+4.(4)\\\\\\Resposta=+25$

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