Question

Qual o valor da expressão algébrica.

Me ajudem por favor marco como melhor resposta e sigo.!!!​

Answer 1

$= 5a {}^{2} + 3b$

$\boxed{a = \frac{1}{2} \: \: \: e\: \: \: b = - \frac{2}{5} }$

$= 5 \: . \: (\frac{1}{2} ) {}^{2} + 3 \: . \: ( - \frac{2}{5} )$

$= 5 \: . \: \frac{1 {}^{2} }{2 {}^{2} } - 3 \: . \: \frac{2}{5}$

$= 5 \: . \: \frac{1}{4} - \frac{6}{5}$

$= \frac{5}{4} - \frac{6}{5}$

$\boxed{mmc(5 ,\: 4) = 20}$

$= \frac{25}{20} - \frac{24}{20}$

$= \frac{25 - 24}{20}$

$\boxed{ = \frac{1}{20} }$

Att. NLE Top Shotta

Answer 2

Resposta:

$= 5 \times ( \frac{1}{2} )^{2} + 3 \times ( - \frac{2}{5} )$

$= 5 \times \frac{1}{4} - \frac{6}{5}$

$= \frac{5}{4} - \frac{6}{5}$

$= \frac{25 - 24}{20}$

$= \frac{1}{20}$