1: =-3/5+4/11+3/5=4/11
2: \(=2020+\dfrac{2021}{2022}+\dfrac{-11}{13}\left(\dfrac{7}{17}+\dfrac{10}{17}\right)+\dfrac{11}{13}\)
\(=2020+\dfrac{2021}{2022}-\dfrac{11}{13}+\dfrac{11}{13}\)
\(=2020\dfrac{2021}{2022}\)
3: \(=\dfrac{3}{7}-\dfrac{2}{15}+\dfrac{1}{4}\cdot8\)
\(=\dfrac{45-14}{105}+2=\dfrac{31}{105}+\dfrac{210}{105}=\dfrac{241}{105}\)
4: \(=23+\dfrac{11}{15}-37-\dfrac{3}{17}-2-\dfrac{14}{17}-13-\dfrac{11}{15}\)
=-29-1
=-30
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