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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
![](https://rs.olm.vn/images/avt/0.png?1311)
\(213=\)\(2.10^2\) \(+1.10+3.10^0\)
\(421=4.10^2+2.10+1.10^0\)
\(1256=1.10^3+2.10^2+1.10^0\)
\(2006=2.10^3+0.10^2+0.10+6.10^0\)
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
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a) 213 = 200 + 10 + 3 = 2.100 + 10 + 3 = 2.102 + 101 + 3
b) 421 = 400 + 20 + 1 = 4.100 + 2.10 + 1 = 4.102 + 2.101 + 1
c) 2009 = 2000 + 9 = 2 . 1000 + 9 = 2.103 + 9
d) abc = a.100 + b.10 + c = a.102 + b.101 + c
e) abcde = a.10000 + b.1000 + c.100 + d.10 + e = a.104 + b.103 + c.102 + d.101 + e
![](https://rs.olm.vn/images/avt/0.png?1311)
213= 10 mũ 2+10 mũ 2+10 mũ 1 cộng 10 mũ 0 cộng 10 mũ 0 cộng 10 mũ 0
421=10 mũ 2+10 mũ 2+10 mũ 2+10 mũ 2 +10 mũ 1 + 10 mũ 1 +10 mũ 0
2009=10 mũ 3 + 10 mũ 3 + 10 mũ 0+10 mũ 0 + 10 mũ 0 +10 mũ 0 +10 mũ 0 +10 mũ 0 +10 mũ 0 +10 mũ 0+10 mũ 0 +10 mũ 0
abc= a.10 mũ 2+b.10 +c.10 mũ 0
abcde = 10 mũ 4.a +10 mũ 3.b +10 mũ 2.c +10.d +10 mũ 0.e
\(213=10^2+10^2+10^1+10^0+10^0+10^0\)
\(421=10^2+10^2+10^2+10^2+10^1+10^1+10^0\)
\(2009=10^3+10^3+10^0+10^0+10^0+10^0+10^0+10^0+10^0+10^0+10^0\)
\(abc=10^2\times a+10^1\times b+10^0\times c\)
\(abcde=10^4\times a+10^3\times b+10^2\times c+10^1\times d+10^0\times e\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Xin lôi bạn, bài 1 mình không hiểu, mình sẽ giúp bạn bài 2 nha.
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B2 :
213 = 2 x 102 + 1 x 10 + 3 x 100
421 = 4 x 102 + 2 x 10 + 1 x 100
1256 = 1 x 103 + 2 x 102 + 5 x 10 + 6 x 100
2006 = 2 x 103 + 0 x 102 + 0 x 10 + 6 x 100
abc = a x 102 + b x 10 + c x 100
abcde = a x 104 + b x 103 + c x 102 + d x 10 + e x 100
![](https://rs.olm.vn/images/avt/0.png?1311)
\(213=200+10+3=2\cdot100+10+3=2\cdot10^2+10^1+3\)
\(421=400+20+1=4\cdot100+2\cdot10+1=4\cdot10^2+2\cdot10^1+1\)
\(2009=2000+9=2\cdot1000+9=2\cdot10^3+9\)
\(abc=a\cdot100+b\cdot10+c=a\cdot10^2+b\cdot10^1+c\)
\(abcde=a\cdot10000+b\cdot1000+c\cdot100+d\cdot10+e=a\cdot10^4+b\cdot10^3+c\cdot10^2+d\cdot10^1+e\)
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
a)\(213=10^2+10^2+10^1+10^0+10^0+10^0\)
b)\(421=10^2+10^2+10^2+10^2+10^1+10^1+10^0\)