Question

100PTS!!! URGENTE!!!!
2. Calcule o valor da expressão seguinte:

Answer 1

Explicação passo a passo:

$y=\frac{2sen30-4cos30+tg60}{cos120-sen60}\\y=\frac{2.\frac{1}{2}-4.\frac{\sqrt{3}}{2}+\sqrt{3}}{-\frac{1}{2}-\frac{\sqrt{3}}{2}}\\y=\frac{1-\sqrt{3}}{\frac{-1-\sqrt{3}}{2}}\\y=(1-\sqrt{3}).\frac{2}{-1-\sqrt{3}}\\y=\frac{2-2\sqrt{3}}{-1-\sqrt{3}}.\frac{-1}{-1}\\y=\frac{-2+2\sqrt{3}}{1+\sqrt{3}}\\y=(\frac{-2+2\sqrt{3}}{1+\sqrt{3}}).(\frac{1-\sqrt{3}}{1-\sqrt{3}})\\y=\frac{-2+2\sqrt{3}+2\sqrt{3}-6}{1-3}\\y=\frac{-8+4\sqrt{3}}{-2}\\y=4-2\sqrt{3}$

Answer 2

Resposta:

自然持續創新教學及所有的方式運作時皆可藉由這些年捲土重來的。

Explicação passo a passo: