\(213=\)\(2.10^2\)   \(+1.10+3.10^0\)

\(421=4.10^2+2.10+1.10^0\) 

\(1256=1.10^3+2.10^2+1.10^0\) 

\(2006=2.10^3+0.10^2+0.10+6.10^0\) 

abc = a . 10 ^2 + b .10 + c .10 ^ 0

abcde = a.10 ^ 4 + b.10^3 + c.10^ 2+ d .10 + e . 10 ^ 0

k cho mk nha

a﴿ 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.10^ 2 + 10^ 1 + 3

b﴿ 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.10^ 2+ 2.10^ 1 + 1

c﴿ 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.10 ^3 + 9

d﴿ abc = a.100 + b.10 + c = a.10^ 2 + b.10^ 1 + c

e﴿ abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.10^ 4+ b.10^ 3+ c.10 ^2+ d.10^ 1 + e

a﴿ 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.10 2 + 10 1 + 3

b﴿ 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.10 2+ 2.10 1 + 1

c﴿ 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.10 3 + 9

d﴿ abc = a.100 + b.10 + c = a.10 2 + b.10 1 + c

e﴿ abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.10 4+ b.10 3+ c.10 2+ d.10 1 + e

987 = 9 . 10² + 8 . 10 + 7;

2564 = 2 . 10³ + 5 . 10² + 6 . 10 + 4;

abcde = a . 10⁴ + b . 10³ + c . 10² + d . 10 + e

987 = 9 . 10² + 8 . 10 + 7;

2564 = 2 . 10³ + 5 . 10² + 6 . 10 + 4;

abcde = a . 10⁴ + b . 10³ + c . 10² + d . 10 + e

\(2\cdot2\cdot2\cdot3\cdot3=2^3\cdot3^2\)

Đề kiểu gì ấy chả hiểu quái gì cả chán 

(Y)

987=9.100+8.10+7.1=9.10²+8.10+7.10⁰

2564=2.1000+5.100+6.10+4.1=2.10³+5.10²+6.10+4.10⁰

abcde=a.10000+b.1000+c.100+d.10+e.1=a.10⁴+b.10³+c.10²+d.10+e.10⁰

987=900+80+7=9.100+8.10+7.1=9.10²+8.10¹+7.10⁰

2564=2000+500+60+4=2.1000+5.100+6.10+4.1=2.10³+5.10²+6.10¹+4.10⁰

abcde=10000.a+1000.b+100.c+10.d+1.e=10⁴.a+10³.b+10².c+10¹.d+10⁰.e

987=9.10²+8.10¹+7.10⁰

^{2564=2.10^3+5.10^2+6.10^1+4.10^0}

^{abcde=a.10^4+b.10^3+c.10^2+d.10^1+e.10^0}

^{k mik nha}