Bài 1
a) $(-16) - l-4l + 8.(-3) $
$= (-16) - 4 + (-24)$
$= -44$
b) l$11$l $- 3.(-2) + (-5)^2 - 2020^0$
$= 11 + 6 + 25 - 1$
$= 41$
Bài 2
a) $x + 15.(-2) = -3 + 1$
=>$ x - 30 = -2 $
=> $x = -2 + 30$
=> $x = 28$
b) $15 - 2x = (-3)^3$
=> $15 -2x = -27$
=> $2x = 15 + 27$
=> $2x = 42$
=> $x = 21$
c) $3x - (-1)^{2021} = (-2).11$
=> $3x + 1 = -22$
=> $3x = -21$
=>$ x = -7$