Question

10x : 5y = 20y

A= 1x + 2x +3x +......+2017x =2018*2019

Ai nhanh và đúng nhất mik tik cho nha ! cảm ơn

Answer 1

10x : 5y = 20y

10x = 20y . 5y

10x = 100xy

10x - 100xy = 0

10x ( 1 - 10y ) = 0

\(\Rightarrow\orbr{\begin{cases}10x=0\\1-10y=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=0\\y=\frac{1}{10}\end{cases}}\)

Answer 2

b) 1x + 2x + 3x + ...+ 2017x = 2018 . 2019

x.(1+2+3+...+2017) = 2018 . 2019

x.2 035 153 = 2018.2019

x = 4038/2017