987 = 900 + 80 + 7
= 9.100 + 8.10 + 7
= 9.10^2 + 8.10^1 + 7.10^0
2564 = 2000 + 500 + 60 + 4
= 2.1000 + 5.100 + 6.10 + 4
= 2.10^3 + 5.10^2 + 6.10^1 + 4.10^0
abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.10^4 + b.10^3 + c.10^2 + d.10^1 + e.10^0
987 \(= 900 + 80 + 7\)
\(= 9 . 100 + 8 . 10 + 7\)
\(=\) \(9 . 10^2 + 8 . 10 ^1 + 7.10 \)
2564 \(= 2000 + 500 + 60 + 4\)
\(=2.1000 + 5.100 + 6.10 + 4\)
\(=\) \(2.10^3 - 5.10^2 + 6.10^1 + 4 .10\)
abcde \(= a.10000 + b.1000 + c.100 + d.10+e\)
\(= a.10^4 + b . 10^3 + c.10^2 + d.10 + e . 10\)
HỌC TỐT NHÉ~~