(20242+20222+20202+...+22)-(20232+20212+20192+...+12)
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\(\left(2024^2+2022^2+2020^2+...+2^2\right)-\left(2023^2+2021^2+2019^2+...+1^2\right)\\ =\left(2024^2-2023^2\right)+\left(2022^2-2021^2\right)+\left(2020^2-2019^2\right)+...+\left(2^2-1^2\right)\\ =\left(2024-2023\right)\left(2024+2023\right)+\left(2022-2021\right)\left(2022+2021\right)+\left(2020-2019\right)\left(2020+2019\right)+...+\left(2-1\right)\left(2+1\right)\)\(=1.\left(2024+2023\right)+1.\left(2022+2021\right)+1.\left(2020+2019\right)+...+1.\left(2+1\right)\)\(=1+2+...+2019+2020+2021+2022+2023+2024\)\(=\dfrac{\left(1+2024\right).2024}{2}=2049300\)
\(\left(2024^2+2022^2+2020^2+....+2^2\right)-\left(2023^2+2021^2+.....+1^2\right)\\ =2024^2+2022^2+2020^2+....+2^2-2023^2-2021^2-....-1^2\\ =\left(2024^2-2023^2\right)+\left(2022^2-2021^2\right)+.....+\left(2^2-1^2\right)\\ =\left(2024-2023\right)\cdot\left(2024+2023\right)+\left(2022-2021\right)\cdot\left(2022+2021\right)+.....+\left(2-1\right)\cdot\left(2+1\right)\\ =2024+2023+2022+2021+....+2+1\\ =\left(2024+1\right)\cdot\left[\left(2024-1\right):1+1\right]:2\\ =2025\cdot2024:2\\ =2049300\)