Lời giải:
$480:[75+(7^2-8.3):5]+2021=480:(75+25:5)+2021$
$=480:(75+5)+2021=480:80+2021=6+2021=2027$
\(480:\left[75+\left(7^2-8.3\right):5\right]+2021=480:\left[75+\left(49-24\right):5\right]+2021=480:\left[75+25:5\right]+2021=480:\left[75+5\right]+2021=480:80+2021=6+2021=2027\)