bai1 tìm x : \(\frac{-64}{343}=x^3\)
\(\left(x-20\right)^{100}+|y+4|=0\)
(\(x-\frac{1}{2})^3=\frac{1}{27}\)
\(\left(x+\frac{1}{2}\right)^2=\frac{4}{25}\)
bai2 tinh: a) \(\frac{8^{14}}{4^{12}}\)
b)\(\left(\frac{-1}{3}\right)^7.3^7\)
c)\(\frac{90^2}{15^2}\)
d)\(\frac{790^4}{79^4}\)