Răspuns: [tex]\bf Suma~cifrelor~numarului=10[/tex]
Explicație pas cu pas:
(*^▽^*) Salutare!
[tex]\bf 2021 \cdot 2^{2021} \cdot 5^{2020} =[/tex]
[tex]\bf 2021 \cdot 2^{2020+1} \cdot 5^{2020} =[/tex]
[tex]\bf 2021 \cdot 2^{1}\cdot 2^{2020} \cdot 5^{2020} =[/tex]
[tex]\bf 2021 \cdot 2\cdot (2 \cdot 5)^{2020} =[/tex]
[tex]\bf 4042\cdot 10^{2020} =[/tex]
[tex]\bf 4042\cdot 1\underset{\it 2020~de~zerouri}{\underbrace{000............000}}=[/tex]
[tex]\bf 4042\underset{\it 2020~de~zerouri}{\underbrace{000............000}}[/tex]
[tex]\bf Suma~cifrelor~numarului=4+0+4+2+\underset{\it 2020~de~zerouri}{\underbrace{0+0+.....+0+0}}[/tex]
[tex]\boxed{\bf Suma~cifrelor~numarului=10}[/tex]
Bafta multa!
#copaceibrainly
