X x 20 x 50 = 100

X x 100       = 100

x                 = 100 : 100

x                 =      1

\(\left(x-\frac{1}{2}\right)^5+\left(y+\frac{1}{3}\right)^3=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-\frac{1}{2}=0\\y+\frac{1}{3}=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=0+\frac{1}{2}\\y=0-\frac{1}{3}\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{2}\\y=-\frac{1}{3}\end{cases}}\)

Vậy \(\left(x;y\right)\in\left(\frac{1}{2};-\frac{1}{3}\right)\)

x + 65 = 25 + 65

x + 65 = 90

x         = 90 - 65

x         = 25 

tim gt nho nhat cua bieu thuc

/x-2019/+/2020-x/

cho \(\frac{a}{c}=\frac{c}{b}\)cm rang

\(\frac{a^2+c^2}{b^2+c^2}=\frac{a}{b}\)