Mọi ng giải hộ em 10,11,12 ạ

Giải thích các bước giải:

10.$\dfrac{-5}7\cdot \dfrac3{13}-\dfrac57\cdot \dfrac{10}{13}+1\dfrac57$

$=-\dfrac57\cdot (\dfrac3{13}+\dfrac{10}{13})+1\dfrac57$

$=-\dfrac57\cdot 1+1+\dfrac57$

$=-\dfrac57+1+\dfrac57$

$=1$

11.$\dfrac{-3}{16}\cdot\dfrac8{15}+\dfrac{-3}{16}\cdot \dfrac7{15}-\dfrac5{16}$

$=-\dfrac3{16}\cdot (\dfrac8{15}+\dfrac7{15})-\dfrac5{16}$

$=-\dfrac3{16}\cdot 1-\dfrac5{16}$

$=\dfrac{-8}{16}$

$=-\dfrac12$

12.$\dfrac{2021}{2022}\cdot\dfrac7{18}-\dfrac{2021}{2022}\cdot \dfrac{11}{-18}$

$=\dfrac{2021}{2022}\cdot(\dfrac7{18}+\dfrac{11}{18})$

$=\dfrac{2021}{2022}\cdot1$

$=\dfrac{2021}{2022}$