\(10+12+14+...+2020\)
\(=\left(\left(2020-10\right):2+1\right)\left(2020+10\right):2\)
\(=1006.2030:2=\text{1020075}\)
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\(10+12+14+...+2020\)
\(=\left(\left(2020-10\right):2+1\right)\left(2020+10\right):2\)
\(=1006.2030:2=\text{1020075}\)