Question

[Nguyễn Thị Minh Châu]

1) Tính :

a)(1000-1^3)(1000-2^3)(1000-3^3)....(1000-2^2018)

2)Tìm x , biết :

\(\dfrac{27}{3^x}\)=3

3) Tìm x, y biết :

a)\(x^2\)+\(\left(y-\dfrac{1}{10}\right)^{2018}\)=0

b)\(\left(\dfrac{1}{2}x-5\right)^{20}\)+\(\left(y^2-\dfrac{1}{4}\right)^{10}\)\(\le\)0

Answer 1

[Giang Thủy Tiên]

\(x^2+\left(y-\dfrac{1}{10}\right)^{2018}=0\\ \Leftrightarrow x^2+\left[\left(y-\dfrac{1}{10}\right)^{1009}\right]^2=0\\ \Leftrightarrow\left[{}\begin{matrix}x^2=0\\\left(y-\dfrac{1}{10}\right)^{1009}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\y=\dfrac{1}{10}\end{matrix}\right.\)