Question

Sau coroana, ex. 6, va rogg mult, dau puncte!!!!

Answer 1

$\big{[}(x+0,7):0,75-\dfrac{2}{3}\big{]}\cdot\dfrac{3}{8}=0,4$
$\big{[}(x+0,7):\dfrac{75}{100}-\dfrac{2}{3}\big{]}\cdot\dfrac{3}{8}=0,4~~~\Rightarrow simplifici~75~si~100~cu~25$
$\big{[}(x+0,7)\cdot\dfrac{4}{3}-\dfrac{2}{3}\big{]}\cdot\dfrac{3}{8}=0,4$
$\big{[}\dfrac{4}{3}x+0,7\cdot\dfrac{4}{3}-\dfrac{2}{3}\big{]}\cdot\dfrac{3}{8}=0,4$
$\big{[}\dfrac{4}{3}x+\dfrac{7}{10}\cdot\dfrac{4}{3}-\dfrac{2}{3}\big{]}\cdot\dfrac{3}{8}=0,4~~~\Rightarrow simplifici~10~si~4~cu~2$
$\big{[}\dfrac{4}{3}x+\dfrac{14}{15}-\dfrac{2}{3}\big{]}\cdot{3}{8}=0,4$
$\big{[}\dfrac{4}{3}x+\dfrac{14-10}{15}\big{]}\cdot{3}{8}=0,4$
$\big{[}\dfrac{4}{3}x+\dfrac{4}{15}\big{]}\cdot{3}{8}=0,4$
$\dfrac{1}{2}x+\dfrac{1}{10}=0,4~~~\Rightarrow amplifici~pentru~a~ajunge~la~numitorul~comun,~care~este~10$
$0,5x+0,1=0,4$
$0,5x=0,4-0,1$
$0,5x=0,3$
$x=0,3:0,5$
$x=\fbox{0,6}$