90000

90000

k minh nhe

3+3=6 là 6 đó

11.999=10989

\(3\cdot\left(x-2\right)^2=2+25\)

\(\Leftrightarrow3\cdot\left(x-2\right)^2=27\)

\(\Leftrightarrow\left(x-2\right)^2=9\)

\(\Leftrightarrow\orbr{\begin{cases}x-2=3\\x-2=-3\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=5\\x=-1\end{cases}}\)

nguyen truong giang lam sai roi

Cũng = 3 thui

\(\frac{1}{2}.5=3\Rightarrow5=6\)

\(\frac{1}{3}.10=\frac{1}{3}.\left(6.2\right)=4\)

Bóng có giá là : (110 + 100) : 2 = 105USD

\(\frac{x+4}{20}=\frac{5}{x+4}\)

\(\Rightarrow\left(x+4\right)^2=20.5=100=10^2\)

\(\Rightarrow\orbr{\begin{cases}x+4=10\\x+4=-10\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=6\\x=-14\end{cases}}\)