Question

Calcule o valor da expressão abaixo:







OBS: simplifique o resultado quando possível. 

 A 

5

 B 

\frac{7}{5}57​

 C 

\frac{1}{5}51​

 D 

\frac{17}{25}2517​

 E 

\frac{21}{25}2521​

Answer 1

Resposta:

OLÁ

VAMOS A SUA PERGUNTA:⇒⇒

$\sf \: 3 \dfrac { 2 } { 5 } \div ( 2 \dfrac { 1 } { 3 } + 1 \dfrac { 5 } { 7 } )$

$\sf\dfrac{\dfrac{15+2}{5}}{\dfrac{2\times 3+1}{3}+\dfrac{1\times 7+5}{7}}\approx 0.84$

$\sf \: \dfrac{\dfrac{17}{5}}{\dfrac{2\times 3+1}{3}+\dfrac{1\times 7+5}{7}}\approx 0.84$

$\sf\dfrac{\dfrac{17}{5}}{\dfrac{6+1}{3}+\dfrac{1\times 7+5}{7}}\approx 0.84$

$\sf\dfrac{\dfrac{17}{5}}{\dfrac{7}{3}+\dfrac{1\times 7+5}{7}}\approx 0.84$

$\sf\dfrac{\dfrac{17}{5}}{\dfrac{7}{3}+\dfrac{7+5}{7}}\approx 0.84$

$\sf \: \dfrac{\dfrac{17}{5}}{\dfrac{7}{3}+\dfrac{12}{7}}\approx 0.84$

$\sf\dfrac{\dfrac{17}{5}}{\dfrac{49}{21}+\dfrac{36}{21}}\approx 0.84$

$\sf\dfrac{\dfrac{17}{5}}{\dfrac{49+36}{21}}\approx 0.84$

$\sf\dfrac{\dfrac{17}{5}}{\dfrac{85}{21}}\approx 0.84$

$\: \: \sf\dfrac{17}{5}\times \left(\dfrac{21}{85}\right)\approx 0.84$

$\sf\dfrac{17\times 21}{5\times 85}\approx 0.84$

$\sf\dfrac{357}{425}\approx 0.84$

$\boxed{\bold{\displaystyle{\clubsuit\ \spadesuit\ \maltese \: \sf \red{  \frac{21}{25}=0.84 }}}}\ \checkmark$

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