895 = 8.100 + 9.10 + 5.1 = 8. 102 + 9.101 + 5.100

abc= a.100 + b.10 + c.1 = a. 102 + b.101 + c.100

thiệt hả giờ mình mới biết đó hậu

\(234=2\cdot10^2+3\cdot10^1+4\cdot10^0\)

\(2056=2\cdot10^3+5\cdot10^1+6\cdot10^0\)

\(2670=2\cdot10^3+6\cdot10^2+7\cdot10^1\)

895 = 8.10² + 9.10¹ + 5.10⁰

abc = a.10² + b.10¹ + c.10⁰

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10³ nhé bạn

\(213=200+10+3=2\cdot100+10+3=2\cdot10^2+10^1+3\)

\(421=400+20+1=4\cdot100+2\cdot10+1=4\cdot10^2+2\cdot10^1+1\)

\(2009=2000+9=2\cdot1000+9=2\cdot10^3+9\)

\(abc=a\cdot100+b\cdot10+c=a\cdot10^2+b\cdot10^1+c\)

\(abcde=a\cdot10000+b\cdot1000+c\cdot100+d\cdot10+e=a\cdot10^4+b\cdot10^3+c\cdot10^2+d\cdot10^1+e\)

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

\(213=100+100+10+3=10^2+10^2+10^1+3\)

\(421=100+100+100+100+10+10+1=10^2+10^2+10^2+10^2+10^1+10^1+1\)\(2009=1000+1000+9=10^3+10^3+9\)

\(abc=10^2a+10^1b+c\)

\(abcde=10^4a+10^3b+10^2c+10^1d+e\)

213 = 2.10² + 1.10¹ + 3.10⁰

421 = 4.10² + 2.10¹ + 1.10⁰

2009 = 2.10³ + 0.10² + 0.10¹ + 9.10⁰

abc = a.10² + b.10¹ + c.10⁰

abcde = a.10⁴ + b.10³ + c.10² + d.10¹ + e.10⁰

\(213=2×10^2+1×10^1+3×10^0\)

\(421=4×10^2+2×10^1+1×10^0\)

\(2009=2×10^3+0×10^2+0×10^1+9×10^0\)

abc=a×10^2+b×10^1+c×10^0

abcde=a×10^4+b×10^3+c×10^2+d×10^1+e×10^0

10 000 = 104; 1 000 000 000 = 109