Giải thích các bước giải:
Ta có:
$M=\dfrac{\dfrac7{2020}+\dfrac79-\dfrac14}{\dfrac59-\dfrac3{2012}-\dfrac12}$
$\to M=\dfrac{\dfrac{63}{18180}+\dfrac{14140}{18180}-\dfrac{4545}{18180}}{\dfrac{10060}{18108}-\dfrac{27}{18108}-\dfrac{9054}{18108}}$
$\to M=\dfrac{\dfrac{63+14140-4545}{18180}}{\dfrac{10060-27-9054}{18108}}$
$\to M=\dfrac{\dfrac{9658}{18180}}{\dfrac{979}{18108}}$
$\to M=\dfrac{441634}{44945}$
