\(=\left(1+3+...+2021\right)\cdot\left[1001\cdot135\cdot137-1001\cdot135\cdot137\right]\)
\(=\left(1+3+...+2021\right)\cdot0\)
=0
= (1 + 3 + ... + 2021) x (135 x 1001 x 137 - 135 x 137 x 1001)
= (1 + 3 + ... + 2021) x 0
= 0
` ( 1+ 3 + 5 + 7 + ... + 2021 ).(135135.137 - 135.137137 )`
` = ( 1+ 3 + 5 + 7 + ... + 2021 ). ( 18513495 - 18513495)`
` = ( 1+ 3 + 5 + 7 + ... + 2021 ). 0`
` = 0`
=(1+3+...+2021)⋅[1001⋅135⋅137−1001⋅135⋅137]=(1+3+...+2021)⋅[1001⋅135⋅137−1001⋅135⋅137]
=(1+3+...+2021)⋅0=(1+3+...+2021)⋅0
=0
