Thực hiện phép tính: a) (4 + 32 + 6) + (10 – 32 – 2) b) 300:4 + 300:6 – 25 c) 17.[29 – (-111)] + 29.(-17) d) 19.43 + (-20).43 – (-40)

$\displaystyle  \begin{array}{{>{\displaystyle}l}}
a) \ ( 4\ +\ 32\ +\ 6) \ +\ ( 10\ –\ 32\ –\ 2)\\
=\ ( 36\ +\ 6) \ +\ ( 10\ –\ 32\ –\ 2)\\
=\ 42\ +\ ( 10\ –\ 32\ –\ 2)\\
=\ 42\ +\ ( –22\ –\ 2)\\
=\ 42\ +\ ( –24)\\
=\ 18\\
b) \ 300:4\ +\ 300:6\ –\ 25=\ 75\ +\ 50\ –\ 25=\ 125\ –\ 25=\ 100\\
c) \ 17.[ 29\ –\ ( -111)] \ +\ 29.( -17)\\
=\ 17.( 29\ +\ 111) \ +\ 29.( -17)\\
=\ 17.140\ +\ 29.( -17)\\
=\ 17.( 140\ –\ 29)\\
=\ 17.111=\ 1887
\end{array}$