\(A=2020+2021+2022+2023+...+2040\)
\(=\left(2020+2040\right).10=40600\)
\(B=587+125+460+875+540+413\)
\(=\left(587+413\right)+\left(125+875\right)+\left(460+540\right)\)
\(=1000+1000+1000=3000\)
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