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Value $of\dfrac {2020} {1x2}+\dfrac {2020} {2x3}+\dfrac {2020} {3x4}+\dfrac {2020} {4x5}+..+\dfrac {2020} {2019x2020}i5$ ... $A$ $2019$ $B$ $\dfrac {2019} {2020}$ C. $2020$ D. $\dfrac {1} {2020}$ $\dfrac {1} {2019}$ E. $O$ $A$ A $O$ $B$ $O$ $C$ $○$ $D$

$x$ $201g$ $2018$ $-|$ $2030$ $\bar{=} $ $-$ $-$ $g019$

$2017$ $2018$ $2019$ $1$ $2018$ $2019$ $2020$ $=$ $2019$ $2020$ $2021$

$8$ $\dfrac {x} {2019}+\dfrac {y} {2020}=2\dfrac {2x} {2019}-\dfrac {y} {2020}=1,$ $:\left(x,y\right)=$ $\left(1\right)$ $\left(2019,$ $2020\right)$ $\left(2\right)$ $\left(2020$ $2019\right)$ $\left(3\right)$ $\left(2019,$ $2019\right)$ $\left(4\right)$ $\left(2020$ $2020\right)$

$12$ $\dfrac {x} {2019}+\dfrac {y} {2020}=2.\dfrac {2x} {2019}-\dfrac {y} {2020}=1,:\left(xy\right)$ $\left(1\right)$ $\left(2019$ $2020\right)$ $\left(2\right)$ $\left(2020,2019\right)$ $\left(3\right)$ $\left(2019$ $2019\right)$ $\left(4\right)$ $\left(2020$ $2020\right)$ $-$

$2018$ $2019$ $2017$ $2018$ $2018$ $2019$ $2019$ $2020$ $2020$ $2021$ $=$ $\left(A\right)$ $2019$ $\left(B\right)$ $-1$ $\left(C\right)$ $2020$ (D) $\right)$ $0$