Bài 1:
a) \(\left(-231+\left|-2019\right|+47\right)-\left(-231+\left|47\right|-\left(-2\right)\right)\)
\(=-231+2019+47+231-47-2\)
\(=\left(-231+231\right)+\left(47-47\right)+\left(2019-2\right)\)
\(=0+0+2017\)
\(=2017\)
b) \(\dfrac{13}{47}.\dfrac{1}{8}+\dfrac{13}{47}.\dfrac{1}{2}+\dfrac{13}{47}.\dfrac{-13}{8}-\dfrac{34}{47}\)
\(=\dfrac{13}{47}.\left(\dfrac{1}{8}+\dfrac{1}{2}+\dfrac{-13}{8}\right)-\dfrac{34}{47}\)
\(=\dfrac{13}{47}.-1-\dfrac{34}{47}\)
\(=\dfrac{-13}{47}-\dfrac{34}{47}\)
\(=-1\)
c) \(\left(2020.2021+2022.2023\right).\left(1^{20}+50\%:1\dfrac{1}{2}-1\dfrac{1}{3}\right)\)
\(=\left(2020.2021+2022.2023\right).0\)
\(=0\)
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