\(\dfrac{83}{250}=\dfrac{332}{1000}=0,332\)

Ghê

1 + 1 = spam = báo cáo

\(\dfrac{\left(-2\right)^{x-1}}{18}=\dfrac{8}{9}\)

<=> \(\dfrac{\left(-2\right)^{x-1}}{18}:\dfrac{8}{9}=1\)

<=> \(\dfrac{\left(-2\right)^{x-1}}{18}.\dfrac{9}{8}=1\)

<=> \(\dfrac{2^{x-1}-1}{2.2^3}=1\)

<=> \(\dfrac{2^{x-1}}{2^4}=1\)

<=> 2^{x - 1 - 4} = 1

<=> 2^{x - 5} = 1

<=> x = 5

107² - 49

= 107² - 7²

= (107 - 7)(107 + 7)

= 100 . 114

= 11400

Mik ko thấy gì cả

oki em

\(\left(\dfrac{5}{3}:\dfrac{77}{9}\right).\dfrac{11}{5}\)

= \(\left(\dfrac{5}{3}.\dfrac{9}{77}\right).\dfrac{11}{5}\)

= \(\dfrac{5.3}{1.77}.\dfrac{11}{5}\)

= \(\dfrac{15}{77}.\dfrac{11}{5}\)

= \(\dfrac{3.1}{7.1}\)

= \(\dfrac{3}{7}\)